Fuel pump VAZ 2110: signs of malfunction and replacement

VAZ 2110 fuel pump injector, VAZ 2112 fuel pump, etc. — electric fuel pumps, installed on many VAZ models with an injector. The operation of this type of fuel pump is partially controlled by an electronic control system (ECM), which takes into account the air-to-fuel ratio, throttle position and exhaust composition.

The VAZ fuel pump (2110, 2112) is designed to supply fuel from the gas tank to the vehicle’s internal combustion engine. In this case, fuel from the car’s gas tank must be supplied uninterruptedly to the internal combustion engine, and under a certain pressure. This is the key to stability and reliability of the car’s power unit.

If the fuel supply is disrupted or stopped altogether, there is a high probability of failure of one of the devices in the overall fuel supply circuit. One of these elements is the VAZ 2110 (21102) fuel pump. Next, we will look at why the pump can fail, what its malfunctions are and how to fix them.

Fuel pump 2110: where it is located and signs of malfunction

The fuel pump for the VAZ 2110 injector is designed to pump fuel from the fuel tank (gas tank) to the vehicle’s internal combustion engine. Inside the fuel pump there is an electrically powered electric motor with a mini-pump, through which uninterrupted fuel pumping occurs.

The VAZ 2110 turbine-type electric fuel pump consists of the following main elements:

outlet fitting;
electric motor;
brushes;
one way valve;
impeller;
inlet and outlet;
coarse filter;

The electric fuel pump on the VAZ works actively, pumping fuel, it is quite noisy and heats up quickly. In this regard, its location is the fuel tank of the car. The pump is a submersible type, that is, it is located directly in the fuel. In this case, the fuel cools the device and also dampens noise.

If we look at the fuel pump on a VAZ 2110, signs of a malfunction usually clearly indicate problems with the fuel supply. As a rule, diagnosing pump faults on a VAZ 2110 (2112) does not cause difficulties for car owners. But before diagnosing a breakdown, you need to know the symptoms.

VAZ 2110 pump and main symptoms of malfunctions:

the engine does not start, there is no pressure in the fuel line, the pump cannot be heard whirring when the starter is running or the ignition is turned on;
When the engine is engaged in gear and at the beginning of the movement, it almost does not pick up speed; it needs to be revved up.
engine starting is normal, at neutral speed the engine easily picks up idle speed, but when driving at high and medium speeds, “twitching”, dips, etc. occur;
the operation of the fuel pump is accompanied by an uncharacteristic sound (loud noise);
There was a noticeable change in the sound of the fuel pump from the moment the ignition was turned on until the fuel was pumped into the fuel rail.

Step-by-step instructions for checking a mechanical fuel pump

First of all, let’s check whether the supply system of your VAZ 2110 is working at all. To do this, you need to take the following steps:

Remove the pump fuel hose from the source or discharge fitting;
Manually press the fuel pump lever several times;
If the pump is operational, a strong stream of fuel will immediately flow through the fitting;
If there is no jet or it is very weak, it will be necessary to carry out other checks.

Next, check the operating condition of the intake valve:

Disconnect the hose from the suction fitting so that both hoses are eventually removed, each from its own fitting.
Simply plug the suction fitting with your finger, then pull the lever several times to manually pump fuel. If everything works fine, your finger will begin to be sucked into the fitting. This effect indicates that the pump is working properly. Therefore, we look for the problem in the tank or lines.
If there is no suction, you will have to disassemble the device to replace the inlet valve. Its tightness is most likely broken.

The next step is to check the VAZ 2110 fuel pump for leaks for this:

Place your finger on the hole from the injection fitting and pump up the fuel several times using manual pumping;
In this case, a stream of air should come out of the hole, significantly repelling the pressed finger;
If the stream turns out to be weak or does not exist, the fuel pump simply does not pump.

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

VAZ 2110 fuel pump: main causes of malfunctions

On the VAZ 2110, the electric fuel pump is generally a fairly reliable mechanism, but under the influence of certain factors, malfunctions can still occur in it. The causes of fuel pump malfunction may be:

faults in electrical wiring and circuits (dirty and rusty contacts, melted or damaged wires, failure of relays or fuses) - interfering with the operation of the gas pump, limiting the required current parameters, which causes failures and difficulties when pumping fuel;
clogging of the fuel filter - a sharp decrease in the pressure created by the pump, accordingly, a deterioration in its performance;
The appearance of debris and foreign impurities in the fuel tank - dirt, rust, mechanical particles, water, etc. (penetrating into the fuel pump, they cause contamination of the fuel pump filter and its breakdown);
natural wear and tear of the rubbing parts of the fuel pump (vehicle mileage from 150-200 thousand km or more).
traveling long distances with a small amount of fuel in the tank - the fuel pump, being not immersed in fuel, quickly overheats, the internal lubricant dries out, the device wears out and fails.

Diagnostics

If it is impossible to start the car, when the starter turns the flywheel perfectly and there is a spark, you should check the fuel supply. If the pump works and gasoline enters the ramp, then the cause should be looked for further. To initially check the operation of the pump, just open the tank lid and, turning on the ignition, listen, the characteristic pumping noise should sound.

You should not immediately change the unit; first you need to check the fuse responsible for the operation of the electric motor of the fuel pump. Even if it is working properly, you need to check the power supply with a multimeter or probe and examine the relay. If power is supplied, then replacing the pump cannot be avoided.

It is more difficult when the pump is running, that is, it buzzes when turned on. First you need to check the condition of the filter, clean it if it is clogged with foreign impurities. Interruptions in operation can also be caused by faulty spark plugs, injectors, sensors, or a decrease in pressure in the fuel line. The pressure in the ramp, in turn, depends on the tightness of the main pipeline connections and the serviceability of the bypass valve.

It would be a good idea to measure the pressure using a pressure gauge with the fuel pump on but the engine stopped. Absence or significant deviation from the norm will indicate a malfunction.

Diagnosis of faults in the VAZ 2110 fuel pump and its replacement

Before you start replacing the fuel pump, you need to make sure that it is broken. The VAZ electric fuel pump is checked in several ways:

checking for mechanical damage - if the mechanism is significantly worn or debris or foreign particles get into it, the operation of the pump will be accompanied by a characteristic noise;
checking the coarse filter for clogging - engine power drops, unstable operation at low and idle speeds, engine starting is difficult, etc.
checking the pressure level in the fuel line - if in transition mode the pump does not produce the required pressure, it means that the coarse filter mesh is clogged, but if, when the return pipe is pinched, the pressure in the fuel line does not reach 0.4 kPa, the fuel pump itself is badly worn.

Please note that at idle speed the pressure value should be in the range of 0.23-0.25 kPa, when starting the engine the pressure value should reach 0.3 kPa, in transition mode the pressure readings should be in the range of 0.28-0.3 kPa. A pressure gauge is used for measurements.

If we consider the 2110 fuel pump, the price, as well as repair of the device, is quite affordable. At the same time, the VAZ 2110 electric fuel pump is usually not repaired, but only inspected (for example, replacing the fuel pump filter), since the pump itself is equipped with a non-demountable housing.

Of course, if necessary, electric fuel pumps are also repaired (repairing brushes and engine commutator, replacing the clutch, rewinding the armature) by experienced specialists, subject to the availability of special equipment. However, the cost of repair will be similar to the cost of a new pump, and sometimes higher.

For this reason, in the event of a breakdown, the pump is immediately replaced with a new one. The price of a VAZ electric pump will depend on the design, configuration and manufacturer. For example, an electric fuel pump 2112-1139009 VAZ-2110 submersible assembly (fuel drain line) PEKAR can be found for 2000-2200 rubles.

Now let's move on to the replacement. Preparatory work before replacing the fuel pump:

prepare tools and materials (screwdriver, socket wrench “10”, wrench, open-end wrench “13”, rags, new pump);
disconnect the battery terminal to prevent damage to electrical equipment and improve safety.
We also recommend reading the article about where the water in the gas tank comes from and what a gas tank moisture displacer is. From this article you will learn where the water in the fuel tank comes from, as well as how and how to remove water from the gas tank.

As for how to change the VAZ 2110 fuel pump, replacing the VAZ 2110 fuel pump and the general algorithm of actions are as follows:

dismantle the seat to gain access to the fuel pump (unscrew the hatch located under the trim and disconnect the electric drive connector);
Unscrew the tip of the fuel pipes with an open-end wrench, and, pulling the pipes, use a spanner to unscrew the eight nuts around the perimeter of the pressure ring to release the flange;
remove the gasket under the pressure ring of the VAZ 2110 pump (the gasket is changed along with the pump);
Lift the fuel pump together with the float, not forgetting to place a rag in the interior to collect gasoline flowing from the body (the remaining gasoline in the pump is about 1 liter).
Reassemble in the reverse order; the correct position of the pump should correspond to the arrow directed towards the trunk (the arrow is located on the top of the lid).

During replacement, you must be careful, do not allow excessive fuel to leak into the cabin, work only with open windows for normal ventilation, etc. Also, when replacing, it is necessary to remove the level sensor and float. When installing a new pump, you need to make sure that the fuel lines are securely fixed, the same can be said about the electrical connectors.

How to replace the electric fuel pump motor 2112 yourself

How to independently replace the electric fuel pump motor 2112 for cars of the VAZ 2101-02-03-04-05-06-07 (Classic), VAZ 2108-09-099 (Lada Samara), VAZ 2110-11-12, VAZ 2113-14- 15 (Lada Samara 2), Lada Kalina (VAZ 1117, 1118, 1119), Lada Priora (VAZ 2170, 2171, 2172), NIVA, Chevrolet Niva and their modifications with BOSCH, January, Itelma and Avtel controllers, except GM .
It's no secret that the heart of any car is the engine, or ICE (internal combustion engine), the result of which is the movement of the vehicle. Like a person, a car has a gas line that powers the internal combustion engine, only in the human body the heart also performs the function of a pump, this function in a car is performed by a gas pump. The gasoline pump ensures an uninterrupted supply of fuel to the engine; the saturation of the internal combustion engine and, as a result, its final power depend on its performance; problems may arise during operation:

— Failure of the fuel pump;

— Contaminated fuel tank.

The electric fuel pump motor 2112 BOSCH is of submersible type, installed in the gas tank located under the bottom of the car body, in the rear seat area. When you turn on the ignition, you should hear the sound of its operation, since at this moment it raises the pressure in the fuel line of the engine power supply system. An electronic control unit, a fuel pump relay and a fuse that protects the electrical circuit of its activation from overloads take part in the operation of the fuel pump.

If, after turning the ignition key to the on position, you do not hear the sound of a running fuel pump for a short duration, then your car’s engine will not start. You need to start looking for the cause of this malfunction by checking the fuse. You need to look for it not in the mounting block, but in the interior of the car. To do this, you will have to unscrew a couple of screws on the right passenger side of the front console and remove the plastic shield. In this case, you will see three relays and three fuses standing in front of you.

Note: All work carried out on the car’s electronics is carried out with the battery disconnected, in order to avoid short circuiting of contacts or the appearance of a spark in a place where there may be gasoline vapors.

In the middle of this row there will be a fuel pump relay, and to the left of it there is a fuse that protects the electrical circuits of the fuel pump and injectors. We take it out and check its integrity, and at the same time it is necessary to look at the condition of the contacts in which it is located. If they are oxidized, they need to be cleaned. If the fuse is intact and undamaged, then you next need to replace the fuel pump relay next to it with a known good one, or ask familiar drivers for “ten”, or you will have to purchase a new one.

You can purchase the electric fuel pump relay 2112 from us!

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If you install a security alarm on your car, which has a function to turn off the fuel pump, then the positive power wire of the fuel pump is cut and an additional relay is installed in its gap, which, in the event of a break-in, should turn off the fuel pump so that the engine stalls and does not start again. In this case, it is necessary to check this relay as well.

If in this case the fuel pump does not work, then you will have to check its functionality next. To get to it you will have to remove the rear seat cushion. Underneath it you will see a hatch closed with a metal cover, unscrew the screws securing the hatch and in the resulting hole you will see the upper part of the gas tank, where the gas pump is installed.

Disconnect the wiring harness and try to power the fuel pump directly from the battery. If it works, then the fault must be looked for either in the wires coming from the fuel pump or in the electronic control unit (ECU).

If your actions to eliminate this malfunction do not lead to success, then you will have to contact diagnosticians at a service station, since it is unlikely that you will be able to check the electronic control unit on your own.

All this indicates irreversible failure of the electric fuel pump motor.

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To replace the electric fuel pump motor 2112, you need to perform the following steps:

— Using a 17 key, unscrew the fuel supply fitting and remove the tube.

— In the same way, unscrew the return fitting and move the fuel pipe to the side.

— Using a 7-head, unscrew the nuts of the pressure plate (8 pieces) and remove the plate.

— Remove the float from the tank hole, remove the electric fuel pump along with the fuel level sensor.

— Unscrew the two screws of the fuel level with a screwdriver and remove it by disconnecting the sensor connector.

— Remove the connector from the fuel pump.

— Using a screwdriver, remove the two clamps and remove the fuel pump from the guides.

— Unscrew the two bolts of the electric fuel pump cover, holding the nuts with a 5mm wrench. — Remove the cover.

— Using a screwdriver, remove the fuel pump mesh.

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The new electric fuel pump motor 2112 is installed on the car in the same way as it is removed, but only in the reverse order of removal.

Before installing the fuel pump into the housing, lubricate the centering rubber bushings with WD-40 lubricant.

Install the fuel pump unit into the tank, with the arrow on the flange pointing to the rear of the car.

All rubber seals should not be scuffed, torn, or sagging; if you see any of these signs, replace the seals with new ones.

Do not reinstall the hatch. Connect the wire to the negative terminal of the battery. Start the engine and check the fuel pump assembly for fuel leaks.

Good luck on the roads.

You will succeed

With the online store Discounter AvtoAzbuka, repair costs will be minimal.

Just COMPARE and BE SURE.

You will also find the information useful: How to identify a problem with the electric fuel pump motor 2112 in a VAZ family car.

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Let's sum it up

Taking into account the above information, it becomes clear that the uninterrupted operation of the electric fuel pump of the VAZ 2110 or any other car will depend on correct and timely preventive maintenance, as well as on careful operation and compliance with certain rules.

We also recommend reading the article on how to change the fuel pump mesh with your own hands. From this article you will learn when and why it is needed, as well as how to replace the fuel pump strainer.

Only clean fuel should be poured into the tank and the fuel filter should be changed promptly. It may also be necessary to periodically change or clean the fuel pump strainer, use a moisture displacer from the gas tank, etc. Please note that it is not recommended to drive with an empty tank as the pump will not cool properly.

Finally, we note that in the event of malfunctions in the operation of the internal combustion engine, it is quite possible to diagnose and replace the fuel pump yourself in a regular garage (if you have the tools). However, working with the fuel system will require increased caution and compliance with all safety measures. If you are not confident in your abilities, it is better to turn to experienced specialists.

Replacing the filler neck of the gas tank pipe

In my practice, there were many cases when, when removing the gas tank on a VAZ 2110, I had to cut off the hose or even the filler neck, since everything was stuck so tightly that it was simply impossible to do otherwise. If for some reason you have damaged the gas tank filler pipe, then the article below will show you the process of replacing this part with a new one.

Tools you will need to complete this job:

Phillips screwdriver
Head for 8 mm, 10 and 13 mm
Ratchet handles
Extension Cords
Penetrating lubricant
Flat blade screwdriver

Removing and installing the tank filler neck on a VAZ 2110

So, the first thing you need to do is remove the rear right wheel and first jack up the car to make it easier to carry out all the repairs. After this, unscrew the clamp bolt that secures the hose and pipe.

Now we go up a little higher and unscrew the neck fastening nut using a 13 mm wrench. This is clearly shown in the photo below.

And another clamp is located above. There you will need a key for 10.

And remove the clamp, putting it aside so as not to lose it. Next, open the gas tank flap and remove the rubber casing.

And now you can carefully move the filling pipe down to bring it to a more convenient position.

And now all that remains is to disconnect the hose from the top of the pipe, which is shown in the photo. We loosen the clamp that tightens this thin hose.

And after trying a little, we remove the hose from the tube:

Now the neck is almost completely freed, and all that remains is to disconnect it from the hose from below, the clamp of which we unscrewed at the very beginning.

After which we remove it without any problems. The end result is shown in the photo below.

The price of a new neck (filler pipe) of a gas tank on a VAZ 2110 is about 1000 rubles, but the same version can be bought at a disassembly site for half the price. Installation occurs in reverse order.

DIY fuel pump replacement

Replacing the electric fuel pump on a VAZ 2110

Everything is already clear about the purpose, location and other features; now let’s turn our attention to the general instructions for replacing the fuel pump. In other words, let's consider the process of replacing a fuel pump on a VAZ on our own. So:

First you need to prepare the car for this procedure. Using a rag, clean the engine, cylinder block and fuel pump from dust and dirt, using white spirit or a special cleaner.
To carry out the following actions, you need two M8 bolts, which are used to plug the holes in the hoses, since fuel leaks out when disconnected.
After this, use a Phillips screwdriver or an “8” wrench to loosen the fastening clamps holding the fuel hoses and remove the hoses from the fuel pump fitting. Now plug the ends of the fuel hoses with M8 bolts.
The next step in replacing a VAZ fuel pump is to remove the mechanism itself. To carry out this procedure, you need to unscrew the two fastening nuts, which are designed to secure the fuel pump to the cylinder block. For work you will need a key set to “13”.

After completing these steps, begin to remove the fuel pump from the studs.

Replacing the gasket

Note! During the work process, you need to pay attention to the general condition of the gasket; if necessary, it is changed.

The heat-insulating spacer is removed and cleaned of dust and dirt. If it becomes unusable, it is better to replace it, like the gasket.

Note. When replacing the gasket on a VAZ car with a mileage of more than one hundred thousand kilometers, before replacing the fuel pump, you need to evaluate the minimum protrusion of the pusher, since the correct placement and stroke of the fuel pump diaphragm mechanism assembly depends on this. In the worst case, fuel supply is reduced. In addition, due to a rupture, the diaphragm itself can fail. The protrusion of the pusher is changed in the process of selecting gaskets located between the cylinder block and the spacer.

When checking the smallest protrusion of the pusher, you need to take into account the gasket, which is located between the fuel pump and the spacer. To ensure the most accurate measurements, it is recommended to install two temporary spacers.
After this, the minimum protrusion is established by slowly turning the crankshaft, while the spacer is pressed against the block. In this way, the protrusion of the pusher is measured. Ideally, this value should be no lower than 0.8 and no higher than 1.3 mm.
If the protrusion of the pusher is more than 1.3 mm, this is a reason to replace the gasket with a thicker one. And in the opposite case, if the size of the protrusion is below 0.8 mm, you need to install a thinner gasket.