How to correctly install a fuel pump on a VAZ 2109 injector

I think that many VAZ 2109-2108 car owners with injection engines know very well that on such models the fuel pump is not located under the hood, as is the case with carburetor cars, but directly in the fuel tank. And getting to it is a little more difficult, since you have to recline the back seat and perform some other steps. But we’ll talk about everything below in order.

So, first of all, it’s worth talking about the tool that we need to do this job:

1. Phillips and flat head screwdriver
2. 7 mm deep socket head
3. Ratchet handle
4. Extension
5. Open-end wrench 17

Replacing a fuel pump on an injection engine

I think that many VAZ 2109-2108 car owners with injection engines know very well that on such models the fuel pump is not located under the hood, as is the case with carburetor cars, but directly in the fuel tank.
And getting to it is a little more difficult, since you have to recline the back seat and perform some other steps. But we’ll talk about everything below in order. So, first of all, it’s worth talking about the tool that we need to do this job:

The process of dismantling and installing the fuel pump of a VAZ 2109 or 2108 injection machine

First of all, I would like to give a more visual video instruction, which I made just a couple of weeks ago using the example of a dozen. But since there is not much difference, I decided to post it here too.

If suddenly the video clip does not load or other problems arise, then below you can consider everything in more detail, only in the form of a photo report.

When the back seat is folded down, on the floor under the carpet you need to find the hatch under which this entire structure is located:

When the bolts have been unscrewed, lift the cover and disconnect the plug, having previously unscrewed the latches on it:

Then, using a 17mm wrench, we unscrew the fuel pipes, resulting in the following picture.

We take them to the side so that they do not interfere with further work. And you can unscrew all the nuts securing the pressure plate in a circle:

Then carefully lift the plate:

After that, prying up the rubber band with a flat screwdriver, we slowly try to remove the fuel pump out.

When it rises a little, then it will need to be tilted about 90 degrees so that the fuel level sensor does not interfere with removal:

The price of a new fuel pump for VAZ 2109-2108 injector cars is about 2800 rubles, so it is better to take care of this unit. And in order not to create unnecessary loads and idle work, make sure that there is always more than 5 liters of gasoline in the tank.

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We remove and install the fuel pump (gasoline pump) VAZ 2108, 2109, 21099

The power supply system for carburetor engines of VAZ 2108, 2109, 21099 vehicles uses a mechanically driven fuel pump (gasoline pump). It is mounted on the engine accessory housing on the battery side.

We remove the fuel pump to replace it, repair it, and adjust the drive. You can replace or clean the mesh filter in it or check the intake and exhaust valves without removing the fuel pump from the engine. When removing the fuel pump, you need to know some features of this work that will help you do everything quickly and correctly.

Necessary tools and equipment

— Phillips screwdriver for loosening the clamps

— Socket wrench (head) at “13” for loosening the fuel pump mounting nuts

Preparatory work

— Clean the fuel pump from dirt

— Place a rag under it to collect gasoline

The procedure for removing the fuel pump for VAZ 2108, 2109, 21099 cars with a carburetor engine

— Disconnect the fuel hoses from the fuel pump fittings

See photo above. There are only two hoses (for the inlet and outlet of the fuel pump) and they are attached to the fittings with clamps. Therefore, we loosen the clamps using a Phillips screwdriver. We move the hoses from the fittings. If the hoses are stuck and do not move, first turn them around the fittings, and then move them, helping yourself with a slotted screwdriver.

Some gasoline may leak from the hoses. To prevent this from interfering with work, you can plug the ends of the fuel hoses with M8 bolts and tighten them with clamps.

— Unscrew the fuel pump mounting nuts

We use a socket wrench or socket set to “13”.

- Remove the fuel pump

We slide it along the studs and remove it. If it doesn’t come off (it’s stuck), gently rock it from side to side (you can even tap it lightly) and then remove it.

We also remove the drive rod and its plastic spacer with gaskets. We do not change the gaskets, as they are of different thicknesses and must subsequently be installed as they were.

That's it, the fuel pump has been removed.

Features of installing a fuel pump on a carburetor engine of VAZ 2108, 2109, 21099 cars

— Defects of parts

Before installation, we decide that you need to change the fuel pump drive rod (if worn), gaskets (if worn or damaged), plastic spacer (if there are cracks).

— Installing a fuel pump on the engine

We install the gaskets, spacer and rod in the same way as they were when removed.

If old parts are replaced (rod, gaskets, spacers), it is necessary to adjust the fuel pump drive. Namely, the minimum amount of protrusion of the pusher (0.8 - 1.3 mm), see “Adjusting the fuel pump drive of VAZ 2108, 2109, 21099 cars.”

We install the fuel pump on the engine with the inlet connection to the battery and the outlet connection to the carburetor (arrow to the carburetor). This will ensure that the engine fuel system operates correctly.

Tighten the fuel pump mounting nuts.

We put the fuel hoses on its fittings and tighten them with clamps.

Use the manual pumping lever to pump fuel into the fuel pump and make sure there are no gasoline leaks.

We start the engine, let it run for a while, and make sure that there is no engine oil leakage from under the heat-insulating spacer and the fuel pump flange. If necessary, tighten the nuts securing it. The tightening torque of the fuel pump mounting nuts is 17-21 N.m.

Notes and additions

— The procedure for removing and installing a fuel pump on a carburetor engine of VAZ 2108, 2109, 21099 cars outlined above is applicable to gasoline pumps of different manufacturers and designs. For example, the DAAZ fuel pump and the Pekar fuel pump.

More articles on the fuel pump of the engine power supply system of VAZ 2108, 2109, 21099 cars

— Disassembly and assembly of the DAAZ fuel pump for VAZ 2108, 2109, 21099 cars

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Mechanical fuel pump repair

The functionality of a mechanical fuel pump can be restored by replacing its faulty elements. You can buy them at any automobile store. But it is better to buy not individual spare parts, but a repair kit. It includes all the elements that can fail:

Replacing valves

How to change apertures

To replace the diaphragms, you need to unscrew the nut by 10 in the upper part of the rod. Next, we remove the damaged elements, and in their place we install parts from the repair kit.

The kit includes three diaphragms: two working and one safety. The latter serves to prevent unauthorized fuel from entering the carburetor if the first two are damaged. It is installed at the very bottom of the rod immediately after the lower “plate”. We place spacers on top of it on the rod: first a small one, then a large one. We place the working membranes and the upper “plate” on them. We secure the resulting structure with a nut.

The mechanical fuel pump has 3 diaphragms

Replacing the pusher, thermal spacer and gaskets

The thermal spacer does not need to be replaced unless it is damaged. Inspect its mating surfaces, especially the outer one, to which the lower part of the pump housing is attached. It should be perfectly smooth. Otherwise, oil leakage may occur at the junction of parts during engine operation.

Replacing the pusher is carried out by removing the old one and installing a new rod in its place. There is no difference in which end where it will be installed.

Now about the gaskets. There are only three of them in the repair kit, and they have different thicknesses:

The first is intended for installation between the thermal spacer and the auxiliary drive housing, and the gaskets “B” and “C” are used to adjust the protrusion of the pusher above its mating surface.

The adjustment is made as follows:

Installation of gaskets and thermal spacer

The thinnest gasket is installed between the spacer and the accessory drive housing

The pusher should protrude 0.8–1.3 mm above the mating plane of the spacer

After the adjustment is completed, the fuel pump is installed in place and secured with nuts.

How to replace the fuel pump on a VAZ 2109 injector

Good day everyone. I decided to replace the mesh on the fuel pump (coarse filter) and see how much minced meat I had accumulated in the fuel.

Having bought the mesh in advance at the auto store, I proceeded to replace it.

The first step is to remove or raise the rear seat.

Remove upholstery and other fabric.

There we see a hatch, we unscrew it.

Under the hatch a large collective farm from the previous owners was waiting for me. Apparently they didn’t want to bother with beauty when they converted the carburetor into an injector and didn’t carefully cut a hole for the hatch, but simply tore the metal. From the outside it looks like an alien crawled out of the gas tank.

Now you need to first disconnect the chip. And start the engine. It will run for a couple of seconds and die. This is necessary in order to relieve pressure in the system and pump gasoline out of the lines. Now we unscrew the mass, fuel lines, and all the clamping bolts in a circle. (here you will need a key for 7).

Next, we move the highways to the sides as much as possible.

We first remove the pressure ring, and then the pump itself. CAREFULLY! There will be gasoline in the pump cup and in the pump itself. The pump will need to be pulled out slightly at an angle, as the float will get in the way. Do not fill the entire interior with gasoline.

We removed the pump. Drain the gasoline and sediment from the glass. (just not back to the tank)

Now we need to remove the glass. This is done differently on different pumps. I have a pump. On it you need to turn the pump upside down and use a small screwdriver to pull out the two rubber clamps.

Now you can see what has accumulated in the glass and on the mesh.

What is a fuel pump?

The fuel pump pumps fuel from the tank to the injector rail. On injection engines, the part is submersible, and its power supply is approximately 12 V. It provides high pressure in the rail, which is why fuel is sprayed from the injectors into the intake manifold.

The injectors on an injection engine are solenoid valves. The moment and time of valve opening is controlled by an electronic control unit. The valve is closed by the action of the return spring. If there is a breakdown, there will be no pressure in the transport system, and fuel will not flow into the combustion chamber.

Replacing the fuel pump

In the car, the part is installed on the fuel tank, rotary type, non-separable and two-stage. That is, if it breaks, it will need to be urgently replaced. Most often, the main causes of failure are a decrease in engine power, periodic howling of the pump, provided that other elements of the system are in good condition.

So, how is a fuel pump replaced in a vehicle?

Source

VAZ 2109 fuel pump injector: do-it-yourself replacement and diagnostics

When considering the fuel system, you should definitely mention the VAZ 2109 injector fuel pump. The injection system consists of several components, which are basic. On our website you can also find information for newer VAZ models, for example, 2110. Nines are also equipped with electric fuel pumps that supply gasoline under a certain pressure to the ramp. Moreover, the pressure must be constant, otherwise the operation of the engine will be unstable. So, what is the injection nine fuel pump and how does it work.

Pump operating principle

The VAZ 2109 fuel pump has a fairly simple design; the injector functions only thanks to it. It is based on two elements - an electric motor and a pump with a filter element. Please note that the “diaper” (as people call the filter for its similarity) needs to be changed on time - try not to let it work for more than 20 thousand km. Otherwise, it becomes saturated with metal shavings, dirt and other rubbish, which gets into the line and clogs the injectors.

The fuel rail contains a mixture of gasoline and air (also purified, by the way). The proportion is always the same - 14 parts of air and one part of gasoline. This is the ideal mixture for combustion to occur. But you need to pay attention to the fact that the VAZ 2109 fuel pump relay, which is controlled by an electronic unit, is involved in the operation. It is used to supply power to the pump motor. The pump's performance is high, so the engine does not run constantly, but intermittently (and depending on the operating mode of the engine, the pauses between starts may be different).

For control, there is a pressure regulator installed on the ramp. To drain excess gasoline - a check valve. With its help, all excess gasoline flows back into the tank. The VAZ 2109 fuel pump (injector) is removed if it is being repaired or replaced. The following tools will be useful:

But if the pump suddenly fails, you should first check the condition of other elements. Carefully inspect the fuse and relay of the VAZ 2109 fuel pump. If they are faulty, then the entire injector will not be able to work normally. As they say, we check the least expensive breakdowns first. If the reason is really in the fuel pump itself, then you can start dismantling it:

The main thing in this matter is accuracy, as there is a risk of damaging the fuel level sensor. And one more thing: before removing the VAZ 2109 fuel pump, you need to get rid of dirt and dust. Therefore, blow the installation area with compressed air or at least clean it with a brush.

To verify the serviceability (or malfunction) of the fuel injection pump of the VAZ 2109, just remove it and connect it directly to the battery. If it works normally, without any extraneous sounds (and air pressure is felt from the outlet), then there are no problems with it. But if it does not turn on even this way, you should think about replacing it. The price of a new one will be about 2000 rubles. Is it worth repairing an electric motor? It is unlikely that this will improve the situation for a long time, but as a temporary solution it is quite normal. But you can do this procedure only if you are confident in your abilities and have an understanding of how electric motors work.

Signs of breakdown

There are several situations in which the pump or its components can be at fault. This will definitely have to be checked. Otherwise, you can spend a lot of money buying and installing a new fuel pump, but in the end it turns out that the problem is completely different.

1. The engine will not start. This is not a clear sign of problems with the pump, but still. Therefore, first check the condition of the spark plugs, the presence of a spark, and the absence of traces of oil on them. Also check the electronic control unit.
2. Pressure inside the fuel system. If the pump is operating normally, it will create a pressure of 3.2 bar. Depending on the type of engine in your VAZ 2114, the characteristics may differ slightly: For a 1.5-liter engine, the optimal values ​​are 285-325 kPa;
3. For a 1.6-liter engine, these characteristics in optimal operating mode will range from 375 to 390 kPa.

New and old coarse filter

Many people purchase the entire fuel module assembly at once, which includes a filter, sensor, float, intake chamber and the pump itself. Such a purchase will cost approximately 3,000 rubles. It is much more profitable and practical to buy a separate pump, which costs up to 1000 rubles. This is due to the fact that when the pump fails, the remaining elements almost always remain intact and are fully suitable for further use.

Pinout and diagram of a fuel pump with a VAZ relay

The fuel pump on a car is designed to supply fuel to the combustion chamber. Its operation is controlled using a relay. On a VAZ (depending on the model), the fuel supply unit can be electrical or mechanical - it all depends on the fuel supply system. On a fuel-injected car, the fuel pump is located in the tank. When the ignition is turned on, voltage is supplied to the terminals of the unit and it begins to pump fuel. If the required pressure is created in the system, the relay automatically turns off the fuel pump - the engine is ready to start.

When the ignition is turned on, the relay creates pressure in the fuel lines by turning on the fuel pump (BN) for a couple of seconds. After this, the BN will work either when the engine is cranked by the starter, or when the engine is running.

Sometimes this system needs repairs - there is nothing complicated here, and the editors of the 2Skhema.ru website will tell you how to do it yourself. Let's start with the BN pinout, then we will indicate it on the diagrams and at the end there will be instructions for replacing the fuel supply elements.

Pinout of fuel pump VAZ 2107

1 – radiator fan drive motor; 2 – mounting block block; 3 — idle speed sensor; 4 – engine ECU; 5 – potentiometer; 6 – set of spark plugs; 7 – ignition control unit; 8 – electronic crankshaft position sensor; 9 – electric fuel pump; 10 – indicator of the number of revolutions; 11 – lamp for monitoring the health of electronic systems and the brake system; 12 – ignition system control relay; 13 – speedometer sensor; 14 – special factory connector for reading errors using the BC; 15 – injector harness; 16 – adsorber solenoid valve; 17, 18, 19,20 – fuse box for repairing the mounting block that protects the injection system circuits; 21 – electronic fuel pump control relay; 22 – electronic relay for controlling the exhaust manifold heating system; 23 – exhaust manifold heating system; 24 – fuse protecting the heater circuit; 25 – electronic air sensor; 26 – coolant temperature control sensor; 27 – electronic air damper sensor; 28 – air temperature sensor; 29 – pressure control sensor and low oil pressure lamp.

You can check the fuel pump on a VAZ 2107 simply by checking the voltage at its connection block with a tester. The presence of voltage will indicate a malfunction of the electric motor. Instead of a tester (multimeter), you can use a test lamp to diagnose a malfunction.

In the absence of one, this can be done by disconnecting the connection block for the fuel pump and fuel level control and applying voltage with wires from the battery to the place where the gray wire is connected +12 and to the place where the black wire is connected - minus. A humming pump will indicate a faulty fuse, power circuit or ECU.

Pinout BN VAZ 2108, 2109, 21099

The fuel pump activation relay (2) is shown by an arrow.

Connection diagram for electric fuel pump VAZ 21083, 21093, 21099 (injector)

On VAZ 21083, 21093, 21099 cars with a 2111 injection engine, an electric fuel pump is installed. It is located in the fuel module installed in the fuel tank.

For VAZ 21083, 21093, 21099 vehicles with ECM control unit (controller) January 5.1 (2111-1411020-61). Euro-2 toxicity standards (one oxygen sensor).

After turning on the ignition, the control unit supplies 12V to the fuel pump relay. The relay supplies voltage to the fuel pump. It turns on and builds up pressure in the engine fuel system. If there is no signal from the DPKV (the crankshaft does not rotate), the ECU turns off the relay and the pump. If the crankshaft rotates, the relay and the fuel pump work. All this work is accompanied by relay clicks and the buzzing of the electric fuel pump in the gas tank.

Notes and additions

— A similar connection diagram for the electric fuel pump (fuel pump) of VAZ 21083, 21093, 21099 cars with an injection engine 2111 and an ECM control unit M1.5.4N. The only difference is the color of the wires.

More articles on injection engines of VAZ 21083, 21093, 21099 cars

Connection diagram for electric fuel pump VAZ 21083, 21093, 21099 (injector): 1 comment

During the operation of any car, the need arises to replace parts and assemblies. If you intend to install a new injector on a VAZ 21099, then in recent years the automaker has been producing a unit with an M73 21114-1411020-12 Itelma controller, for which you will also have to replace the wiring.

Carrying out repair work

Older car models have carburetors and a mechanical fuel system. Such a device breaks down less often compared to injection-type cars. The latter are equipped with an electrical system and a modern fuel pump. The electronic system controls the level and speed of fuel supply. The functions of the gas pump are to transport fuel from the tank to the point where the mixture is formed, as well as to create the required pressure level.

It is easier to carry out any repairs yourself if you know the sequence of individual operations. First, you need to check the device for the absence of factory debris (small metal particles) inside the fuel tank, which can get into the pump and damage it.

All repair work related to the functioning of gasoline pumps can be divided into several areas:

1) if foreign particles are found in the fuel tank, it must be washed. If it is impossible to wash out all the debris, the tank must be replaced;

2) oil leakage is a signal to check the junction of the cylinder block and the fuel pump. The thermal insulation gaskets are also checked;

3) to remove the pump, you need to disconnect the injection and supply fuel lines, then unscrew the fastening nuts and remove the washers on the springs. After this, it is possible to dismantle the fuel pump itself;

4) a malfunction of the pump can be caused by a deformed diaphragm. In this case, it must be reinforced with plastic film;

5) cars with high mileage may have diaphragm springs weakened by load. Repair - stretching the spring and putting it back in place.

This article answers the car owner’s question: is it possible to independently repair the fuel pump in an injection-type car? Not only can it be done with your own hands, but it is also not complicated, as the video confirms:

How does a fuel pump work?

There is nothing complicated about the fuel supply system. A conventional pump, which is driven by the rotor of an electric motor. To protect the entire fuel system from small particles, a filter is used. But this is not the end of the features, because it is worth noting that it is necessary to maintain the pressure in the ramp at the same level. And the VAZ 2109 fuel pump (the injector simply cannot work without it), provided that it constantly pumps gasoline, will begin to pump up the pressure higher and higher. And this will disrupt the operation of the system.

Therefore, it is necessary to adjust the pressure. For this, a special device is used, which is called a pressure regulator. It is installed in the fuel rail and connected to a pipeline that serves to dump excess gasoline into the tank. When the ignition is turned on, the rail pressure sensor is polled, after which the fuel pump drive is turned on. After the pressure in the rail has increased to the required value, the fuel pump is turned off. Therefore, it does not work all the time.

Symptoms of a problem

A faulty fuel pump can be determined by several signs:

• Starting the engine is difficult or not possible at all;
• Unstable engine operation in idle mode;
• When the ignition is turned on, the fuel pump does not operate briefly to create pressure in the system;
• Loss of power, “dips” during acceleration.

The above symptoms also appear during other malfunctions of engine power system components. Before you start checking the fuel pump, you need to be sure that:

• The pressure regulator and nozzles operate in their own mode;
• The fine fuel filter is not dirty;
• Sensors that affect mixture formation work properly. We recommend checking the mass air flow sensor, throttle position sensor, and lambda probe.

Also, if the “CHECK” lamp on the instrument panel lights up, you need to perform computer diagnostics.

Fuel pump VAZ 2109 injector

>The fuel pump for the VAZ 2108 2109 21099 is installed with an electric injector. That is, it is turned on by supplying +12V voltage from the battery to it. It is located in the gas tank of the car. The task of the fuel pump is to supply fuel under pressure into the fuel rail, from where it is sprayed directly into the working cylinder using the injection system. Checking the performance of the fuel pump VAZ 2108 2109 21099: 1) When the ignition is turned on, the pump should start working. That is, the sound of its operation should be heard in the rear seat area. Therefore, the very first thing you need to do is check the fuse and the fuel pump relay. The assignments of the relays and fuses are labeled on the back of the mounting block cover. If the fuse is intact and the relay is working properly, then you need to remove the back seat of the car and measure the voltage at the fuel pump itself. This is done using a multimeter or wires with a 12V light bulb.

The injection VAZ 2109 has an electric fuel pump

If there is voltage at the pump, then everything is fine with the electrical part; you need to look at the fuel system. If voltage is not supplied to the fuel pump, you need to check the wire from the mounting block to the fuel pump; it may be damaged. 2) On the VAZ 2108 2109 21099 injector, it is not recommended to allow the fuel level in the tank to be less than 10 liters. Not the most convenient requirement, given that the car’s gas tank capacity is 45 liters. However, there is a reason for this: if the fuel level in the gas tank is low, the gas pump may catch air, which is unacceptable.

If you do not have a pressure gauge, the operation of the gas pump can be checked by the amount of fuel pumped per unit of time. Having unscrewed the spool, we connect a hose to the ramp, which we lower into the container for measurement. On Kalina and Grant, the pump should pump 35 liters per hour, or 0.5 liters. in a minute. At ten, the pump pumps 1 liter. in a minute. If much less fuel has leaked out, all filters must be checked. Under the bottom, next to the gas tank, there is a high-pressure filter. Another filter that needs to be checked is located in the tank itself on the fuel module. What to pay attention to: To remove the fuel pump from the car, you must remove the fuel tank. The VAZ 2108 2109 21099 fuel pump and injector cannot be removed directly from the passenger compartment, you can only check the voltage supply to it.

Fuel quality and fuel pump life

ECU VAZ 21099 injector

The practice of using electric fuel pumps has shown that their service life directly depends on the quality of the fuel that is poured into the car tank. If you drive on domestic fuel, then do not expect the device to last more than 3 years.

Of course, if the latter breaks down, the best thing to do is replace it. However, their cost can reach from 50 USD. and higher. Therefore, it would be advisable to carry out partial repairs yourself. Why partial, read on.

The easiest way to repair is to assemble one worker from 2 - 3 units lying around in the garage, replacing only the gate holder. But, unfortunately, not everyone has spare fuel pumps.

Checking the pump on the injection "nine"

The VAZ 2109 with an injection engine has an electric pump. It is powered by receiving voltage (12 V) from the battery. Its location is directly in the Lada gas tank. The mission of the electric pump is to deliver gasoline to the fuel rail under high pressure. Next, the fuel from the ramp enters the nozzles, which inject it into the combustion chamber.

If the injector on a VAZ 2109 does not pump the fuel pump, check the following elements:

A working fuel pump should start working when the engine starts. The sound of its operation should be heard under the rear seat. We begin the first stage of verification.

Checking the electrical circuit

At the beginning of the diagnosis, you should check the electrical circuit of the fuel pump. To do this you will need:

1. car tester (multimeter);
2. crosshead screwdriver;
3. two pieces of wire about 2 m long.

Checking the electrical circuit is carried out in the following order:

• Turn on the ignition without starting the engine. When the key is in the first position, a click should be heard, characteristic of turning on the relay, followed by a slight whirring of the pump electric motor. If there is no click, the relay is faulty or is not receiving power. If there is a click, but no buzzing, the wiring coming from the relay or the pump motor itself is faulty.
• Under the glove compartment, find an additional mounting block consisting of three relays and three fuses. The pump relay is located in the middle, and the fuse is located to the left of it. Remove the fuse from its socket, test it with a multimeter, and if the result is negative, replace it. When replacing the fuse, please note that it is rated for a maximum of 15 A.

The relay and fuse for the fuel pump on the VAZ 2114/2115 are located in the mounting block under the glove compartment.

• Set your multimeter to voltmeter mode. Connect one probe of the device to the relay terminal to which the pink wire fits, and the second to the car body. Turn on the ignition. The device should show the on-board network voltage in the range of 11.7–12.4 V. If there is no voltage, the problem may be a broken wiring or a malfunction of the ignition contact group. In this case, it is better to contact an auto electrician. If power is supplied, check that the relay is working. With the ignition on, use a screwdriver or a piece of wire to close the contacts to which the pink and gray wires go. This closes the circuit bypassing the relay. If the fuel pump works, replace the relay.
• Be sure to check the connection of the pump's negative wire to ground. Often it is the lack of “ground” that causes interruptions in the operation of the fuel pump. Remove the plastic trim from the center console near the parking brake handle. Under it there is a “negative” wire of the pump, screwed to the body with a self-tapping screw. Unscrew it, clean the contacts, screw it back and repeat the test.

The ground wires of the fuel pump are attached to the body with a self-tapping screw

Then check the fuel module. Remove the rear seat, peel back the carpet and sound insulation. Unscrew the two screws securing the gas tank flap and disconnect the electrical connector on the fuel module cover. Using two wires, supply power to the pump directly from the battery. If the pump works, the wiring is faulty; if it doesn’t work, the pump itself is faulty.

Removing and replacing the fuel pump on VAZ 2108, 2109, 21099 (injector, carburetor)

Hello, in this article you will learn how to replace the fuel pump on injection and carburetor VAZ 2108, 2109, 21099. The fuel pump is usually changed if there is low pressure in the fuel system, or the pump does not pump fuel at all. First, let's look at replacing a fuel pump on a carburetor car. In fact, in the case of a mechanical fuel pump, such situations as pump leakage are possible, i.e. when it starts to drip, and if your fuel pump on a carburetor car starts leaking, under no circumstances drive it, gasoline will drip directly onto the hot outlet. Automotive stores sell repair kits for mechanical fuel pumps, but usually repairing a fuel pump has a short-term effect, so it is better to replace it with a new one. In order to remove the fuel pump, you need to unscrew the clamps on the fuel hoses and pull them off the pump (gasoline will flow from the hoses, so prepare some kind of container and plugs for the hoses in advance)

Lada 2115 Queen NeFertiti › Logbook › Inspection of the gas tank and pump mesh... + AGAIN the air leak is buggy...(((

Hi all! Having gathered my strength, I decided to climb into the gas tank to inspect and establish the reasons for the strange behavior of the car... the reasons are here... Previously I wanted to compare the pressure before and after the replacement... BUT none of my friends had a device for measuring... pIchal... I thought about it and bought it for myself so that it would be ...maybe come in handy on the farm))) (600rub)

I took measurements before replacing the mesh... in the end we have...

This was followed by disassembly and removal of the module and mesh... in the tank I expected to see a worse picture, but what I saw was also not pleasing...

You scooped up all the gasoline from the tank with a glass... it turned out to be about 9 liters... I started again... (read about this below...)

I wiped off the residue in the tank with gauze...

I fill in 5 liters and again a little rust flows out of some cracks... We repeat the scooping and again the gauze is used...)))

The second time, nothing else seemed to float up (settle) at the bottom...

We fill up with gasoline (9 liters), rock the car and see that the tank is clean and so is the gasoline...

We put everything back together and connect it, start the car... I forgot to take a photo, but I’ll say this... The pressure at XX has not changed, but with the gas boost it reaches 3.0 and that’s it... the regulator resets the excess...))) cool)))) at least I achieved something after this procedures…)))

(previously it did not rise above 2.7)

By “+” I can note that the speed has stabilized, the car does not jerk when starting from a cold place, and it seems like dynamics have appeared...

Finally, to this part of the post, I’ll show you what the mesh on the pump looks like after 30,000 miles... I think it was the reason for the dullness when accelerating because the pump stupidly overheated and could not provide the required amount of fuel...

Now I’m wondering how long it will take to change it? it's not business to drive like that(((

Next we move on to the second part of the recording and to those mysterious 9 liters that I scooped out of the tank... and here’s the thing...

Before getting into the tank, I tried to look for gasoline as much as possible so that I had to scoop less... at the time of disassembling the system in the tank there was: -according to the BC 4.6 liters...
-according to the tidy, the needle was already at zero and lit up at 5 liters according to the BC
... strange... not true ? because as we know, the light bulb seems to light up when there are 6-7 liters of residue... Who will solve the riddle.

In fact, there were about 9 liters of fuel in the tank. neither one nor the other guessed or gave the necessary testimony...

After I filled and assembled everything in place, I filled the required amount of fuel into the BC... BUT the needle never came to life...(((

I think I should try filling the tank full and see... maybe it’s caught on something?

I look forward to your thoughts and comments...

Thank you for your attention! All the best, smooth roads and clean gasoline. )))

Fuel pump VAZ 2109: how the injector works. Replacement and inspection

You will need to consider the features that the VAZ 2109 fuel pump has. If the injector is in the fuel injection system, then the pump is of an electric type. Its use is due to the need to control the fuel supply to the combustion chambers. But, as you know, gasoline first enters a special ramp, in which it is mixed with air in a certain proportion (14 to 1). It maintains constant pressure, with the help of which the mixture is supplied to the combustion chamber through holes in the electromagnetic injectors. These are devices that transform the air-fuel mixture into very small droplets. Essentially, the mist in which the gasoline is suspended in the combustion chamber is ignited.

How does a fuel pump work?

There is nothing complicated about the fuel supply system. A conventional pump, which is driven by the rotor of an electric motor. To protect the entire fuel system from small particles, a filter is used. But this is not the end of the features, because it is worth noting that it is necessary to maintain the pressure in the ramp at the same level. And the VAZ 2109 fuel pump (the injector simply cannot work without it), provided that it constantly pumps gasoline, will begin to pump up the pressure higher and higher. And this will disrupt the operation of the system.

Therefore, it is necessary to adjust the pressure. For this, a special device is used, which is called a pressure regulator. It is installed in the fuel rail and connected to a pipeline that serves to dump excess gasoline into the tank. When the ignition is turned on, the rail pressure sensor is polled, after which the fuel pump drive is turned on. After the pressure in the rail has increased to the required value, the fuel pump is turned off. Therefore, it does not work all the time.

How to remove the fuel pump

The VAZ 2109 fuel pump is located under the rear seat. The injector implies its installation directly in the tank. The thing is that the pump is a submersible type. In the same unit there is a float-type fuel level sensor. It works due to the fact that the float moves the slider using variable resistance. At the same time, the current in the power circuit changes. The amount of gasoline remaining in the tank is determined by the magnitude of the change. To remove the pump you will need to use pliers, screwdrivers and an 8mm wrench.

It is quite possible that the reason that fuel is not supplied is a non-working VAZ 2109 fuel pump relay. The injector contains it, as well as a fuse, which could easily burn out. Before starting work, thoroughly clean the entire cover so that after removal no dust gets inside the tank. Then, using a screwdriver, loosen the clamps that secure the hoses. Remove them; if you can’t do it with your hands, try gently squeezing them with pliers and twisting them. After this, use a size 8 wrench to unscrew all the nuts that secure the lid to the tank body. Please note that there are washers there. Don't lose them. That's all, now the pump can be easily removed for replacement or repair.

Checking the pump's functionality

It is easy to check the VAZ 2109 fuel pump even without special instruments. The injector will not be able to operate without pressure in the fuel rail. Therefore, you need to keep the pump motor spinning. It’s easy to check; just connect its terminals to the battery. If you are afraid, then turn on an incandescent lamp in the gap of one wire. It will help determine the health of the motor winding. Please note that the filter must be as clean as possible. If it is clogged, be sure to change it. Otherwise, the pump will not be able to create the required pressure.

Pump installation

Pay attention to the condition of the wires when replacing the VAZ 2109 fuel pump. The injector involves powering the engine from the on-board network, so there should be no breaks or destruction of the insulation. Installation of the fuel pump is carried out in the reverse order of removal. First, place the body in the tank, landing on the studs. Then you need to tighten all the nuts, then put the hoses in place and connect the plug with the wires.

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Checking the general condition of the fuel pump

First of all, let’s check whether the supply system of your VAZ 2109 is working at all. To do this, you need to take the following steps:

Intake Valve Check

Leak test

To check the tightness of the intake valve, you must:

In this situation, there are two options - look for the problem inside the fuel pump device, disassembling the pump, or change the entire unit.

The filter is clogged or damaged

To fix the situation, you need:

Pump diaphragm failure

You need to do the following for your fuel pump:

Be sure to simultaneously check the condition of the spring located under the diaphragm. To do this, you need to remove the upper part of the pump housing, remove the diaphragm rod and look at the current state of the spring. If it is broken, deformed or lacks elasticity, replace the element.

Node elements

Intake and exhaust valve malfunctions

If both valves raise doubts about their functionality, certain measures will have to be taken.

In the case of the Pekar pump, two valves are located in the cover, so to assess their condition, simply remove the cover from the fuel pump housing.