What pressure should the fuel pump produce for a VAZ 2110, principles of operation, malfunctions

The topic is open to those who are looking on the Internet for information about the technical characteristics of the Bosch fuel pump for the VAZ 2110. If you were looking for information about the fuel pumps for the VAZ 2110 Bosch, then this is an incorrect request.

Fuel pumps most often mean high-pressure fuel pumps, also known as injection pumps, and this is closer to diesel fuel systems. Gasoline engines have fuel pumps - mechanical and electric.

On the VAZ 2110, the Bosch electric fuel pump is probably the most popular fuel pump, because it has a relatively low price and universal dimensions, as well as availability in most stores.

Let's look at the following topics:

  • Fuel pump VAZ 2110 Bosch performance/pressure

  • Characteristics of Bosch fuel pumps and specifically the Bosch fuel pump 0580453453

Lada Priora Hatchback ✤ℨℰȴеℋÅЯ МОШℵИЯ!!! › Logbook › The main thing about the pressure in the fuel system.

Fuel pressure in the car system is one of the important parameters that is used in engine diagnostics. The behavior of the car in various operating modes depends on the pressure. How to measure the pressure in the fuel system with your own hands

For example, buy a device to check fuel pressure. A kit with a fuel pressure gauge, adapter and drain will cost you 1400-1500 rubles. Pay 300-400 rubles to the service station and take measurements there. You can also measure the pressure in the fuel system with an air pressure gauge, which is used to measure tire pressure. Here at this point in more detail. Let's take the example of the tenth VAZ 2110 family. Otherwise, the procedure is similar to any other car. The peculiarity of pressure gauges is that their initial scale values ​​have relative inaccuracy. What does it mean. If the air pressure gauge has a scale of up to 16-20 atm (when the measurement limit for fuel is 5-7 atm), then pressure measurements will not be accurate due to this error, which will fall within the initial values ​​of the instrument scale. Therefore, it is correct to check the fuel pressure with a fuel pressure gauge with a limit of 6-7 atm.

We take a pressure gauge and wrap a piece of foam (plumbing flax) under the pipe and put on an oxygen hose with an internal diameter of 9 mm. Secure with clamps. Place a rag on the generator (so as not to start a fire under the hood). Unscrew the plastic cap on the fuel rail.

put the hose on the pressure gauge

Under the cap there is a hole with a nipple. Unscrew it from the wheel cap. Due to the residual pressure in the rail after removing the nipple, gasoline will splash out.

If desired, you can relieve the pressure in the vehicle's fuel system. To do this, you need to remove the fuel pump fuse and wait until the running car stalls.

We put the second end of the hose on the ramp hole and secure it with a clamp. We remove the rag from the generator and start the engine. Don’t forget to cover the generator with a rag again before removing the hose from the ramp. That's it, now you know how to check the pressure in the fuel system in the field.

attach the hose with pressure gauge to the fitting

check the fuel pressure in the system

By the way, instead of clamps, you can use the classic adjusting bolt bushing. It screws perfectly onto the ramp fitting. To seal, we put a suitable rubber ring on the fitting. On the other side of the bushing we solder a fitting onto which we put a hose with a pressure gauge.

What pressure should be in the VAZ 2110 fuel system? 2.8–3.2 bar (2.8–3.2 atm)

How to measure fuel pressure in a system where there is no return? On VAZ 2110 with 1.6 liter engines, the pressure in the ramp is constant and amounts to 3.6-4.0 atm. Otherwise, the measurement technique is similar. Alternative ways:

It is measured at the outlet fitting of the fuel pump module - this is the one with one tube. You will need a flexible gas-resistant hose with an internal diameter of about 8 mm and a pressure gauge (you need to remove the tube and put on a hose with a pressure gauge instead). The pressure should be 5-7 atm. Close the return line, as is done on an internal combustion engine with a drain ramp, but you must turn it off again at the fuel pump itself. We pull off the second hose (double) and insert a plug into the removed hose, made, for example, from an old fuel filter (saw off the nipple from it and plug it). A single hose must be put on the pump fitting, and now the measurement must be made at the fuel rail. According to the power system diagram, everything will be clear.

Rail pressure indicator

It is extremely important to check the indicator in the fuel rail at the same time.

  1. For a 1.5-liter engine - 280-320 kPa.
  2. For a 1.6-liter power plant - 370-380 kPa.

On the other hand, there is no specific value for the pressure in the ramp. The norm for the performance of all elements of the fuel system is considered to be higher than 2.8 bar. As for the top point, there are no restrictions.

Here, for example, is what data should be there if there are no difficulties in the functioning of the vehicle and its elements.

  1. In XX mode the indicator should be 2.5 atm or higher.
  2. With the sensor tube removed – 3.3 atm and higher.
  3. When the return channel is clamped - 7 atm.
  4. When over-gasping – jumping up to three atm and gradual recovery by 2.5 atm.

If the indicator does not correspond to the factory values, we can conclude that the filters, pump or RTD (sensor) are faulty.

The pressure indicator on systems without return is slightly different. Here it can vary between 3.6 - 4 atm.

How to measure

All you need is a pressure gauge, which is designed to measure tires. It just needs to be modified a little by changing the scale. It is better to measure the pressure in the injection system with a device scale showing a variation within 6-7 atm.

There are other, more advanced measuring instruments. A special tool kit with a pressure gauge, adapter and drain hose is sold at an auto parts store. Costs about 1.5 thousand rubles.

Pressure can be measured at any car service center. They will charge nothing for the service - 500-600 rubles.


Professional pressure gauge for measuring fuel

But whatever one may say, an experienced motorist should have his own pressure gauge among his tools. If it is purchased, then with it the driver receives all kinds of adapters that allow pressure measurements on a wide variety of car brands. In addition, commercial pressure gauges are equipped with a better scale that allows you to measure pressure more accurately. And a professional pressure gauge is generally a godsend, since it makes it possible, among other things, to relieve residual pressure in the system, which increases the accuracy of the readings.

If you decide, nevertheless, to use a homemade pressure gauge, then remember!

It is better to use a regular air pressure gauge from VAZ, since it can also measure oil pressure (you just need to unscrew the fitting). Instead of an adapter, you can use a regular threaded fitting. It is important to use high-quality clamps so that there are no gaps.

How to take measurements.

  1. Most often they are carried out with the ignition on. It is necessary to check whether the arrow has jumped in comparison with the standard value.
  2. Measurements are also carried out in XX mode.
  3. Measurements are carried out with the “return” compressed and with the RTD reset.

Different measuring methods

In addition to measuring against the wall, there are many other ways to measure yourself. One of the options for checking the fuel supercharger is the “plug” diagnosis. In this case, the return line is clamped for two seconds, the engine starts, and the pressure reading is taken.

Another testing option. The speed of the power plant increases to three thousand revolutions per minute. At the same time, you need to monitor the instrument readings. If the pressure drops to 0, this is a sign of a “dead” pump.

The pressure on the ramp is measured as follows:

Measurements are made in different ways:

Procedure for replacing the fuel pump VAZ 2110

To replace the fuel pump, you will first need to dismantle the failed device; for this it is recommended to use the algorithm of actions described below:

Taking into account the peculiarities of the location of the fuel pump in the VAZ 2110, you will first need to remove the upper surface of the engine. A large amount of dust and other dirt often accumulates on the cylinder block and the pump itself, so they need to be wiped with a damp cloth or a brush with soft bristles; you can use special means.

It is recommended to prepare several bolts with a diameter of 8 mm in advance. They will be used as plugs for the hoses, and during the process of dismantling the pump there will be no time to search for them, since fuel will immediately begin to flow out of the holes.

At the incoming and outgoing hoses, you need to loosen the side clamps that secure them. This can be done using a screwdriver or a wrench specially designed for such purposes. Immediately after loosening their position, it will be possible to remove the clamps from the fittings and dismantle the injector.

The cylinder block will also need to be removed, since the device is securely fixed to it. This is quite easy to do if you unscrew a few nuts using a 13mm wrench.

Immediately after removing the nuts, the position of the fuel pump will weaken and it can be removed

It is also worth paying attention to the gasket located between the pump and the spacer - it has an extremely short service life, so it is best to replace it along with the main device.

The spacer is necessary to ensure reliable protection of the fuel pump from high temperatures; When replacing the device, it should be cleaned of accumulated dust and dirt. There is another gasket between the spacer and the cylinder block; it is also recommended to replace it due to rapid wear.

After removing the old fuel pump, you can proceed to installing a new device, for this you should use the instructions below:

  1. If the car has a mileage of 100,000 km or more, you will first need to check the minimum protrusion of the pusher - the location of the new fuel pump and the correct functioning of it will depend on it. Otherwise, there is an increased risk of a significant reduction in fuel injection, which can lead to diaphragm rupture. Changing the protrusions of the pusher usually does not cause difficulties; it is enough to simply select and install suitable gaskets that will be located between the spacer and the cylinder block.
  2. Once the correct minimum projection is set, you should start turning the crankshaft at a low speed. At this time, the spacer should be pressed tightly against the cylinders, which will make it possible to measure the indicator of the pusher protrusion. The value can be dynamic and fluctuate constantly, but only within 0.8–1.3 mm. The gasket is changed in cases where the pusher is outside the specified range: depending on whether the value is too small or too large, its thickness is also reduced or increased.
  3. At the final stage, all dismantled parts and devices are installed. This process is not difficult; to implement it, it is enough to use the previous instructions, repeating all the described steps in reverse order.

Causes of malfunction

During operation, VAZ 2110 car owners may encounter some difficulties associated with this element. Malfunctions of the VAZ 2110 injector fuel pump can be as follows:

  • element failure due to breakdown;
  • a dirty tank or low-quality gasoline with foreign inclusions that contaminate the pump filter.

The very first sure indication that the VAZ 2110’s fuel pump is faulty is the following symptom: the engine “jerks” during operation, especially at medium and high speeds. This indicates that the fuel pressure is insufficient. But this is precisely what the fuel pump is responsible for. But sometimes the reason should be sought in the injectors, as well as the RTD.

Fuel pump VAZ 2110 disassembled (in the photo you can see the dirt in the glass)

There are main signs of a malfunction of the VAZ 2110 injector fuel pump, in which you should definitely take action to check this component:

  1. A loud noise that the element has not previously made.
  2. The vehicle refuses to gain speed and also does not move when engaging first or second gear.
  3. The car moves jerkily and behaves strangely on the road.
  4. The engine suddenly stopped running.

Each of the VAZ 2110 fuel pump malfunctions must be carefully considered in order to understand what to do if you encounter them.

The fuel pump does not pump: causes and diagnostics

Let's start with the fact that if the gas tank is full, the battery is charged, the spark plugs are dry and there is a spark, the starter turns the engine normally, but the engine does not seize, then you should pay attention to the gas pump. A common problem is that there is no power to the fuel pump after the ignition is turned on.

In a similar way, the malfunction manifests itself in motion, when the power to the fuel pump is lost and the engine suddenly stalls.

An equally important point is how much the fuel pump pumps. In other words, the pump may hum and buzz (power is being supplied), but not create the required pressure in the fuel line. The pressure in the fuel system with a working fuel pump must be more than 3 bar (which depends on the specific car model). The indicated pressure is accumulated in the fuel rail and has an indicator of 300 kPa and above.

To check, you need to measure the pressure in the fuel rail with a pressure gauge, taking into account the indicators that are the norm for a specific car model. Using the example of injection VAZs, the pressure when the ignition is turned on is 3 atmospheres, at idle the figure is 2.5 atmospheres, when you press the gas 2.5-3 atmospheres. This method will help you accurately determine:

  1. malfunction of the fuel pressure regulator in the rail;
  2. breakdown of the fuel pump or a noticeable decrease in its performance due to wear;
  3. severe contamination of filters (fuel filter and/or fuel pump mesh);

In the second case, when you press the gas, the pressure does not increase; in the latter case, the pressure gauge needle rises, but very slowly or jerkily.

A decrease in pressure below the norm will lead to the fact that the engine may not start or start with difficulty, stall, jerk, operate unstably and with failures. If this happens due to the fault of the pump and not the fuel filter, then there is a high probability that the coarse filter screen of the fuel pump is clogged. In this case, there is no need to change the fuel pump itself, since it will be enough to replace or even clean the mesh.

If you suspect that there is no voltage to the fuel pump, there is a quick way to check. It is enough to turn the ignition key and listen, as when you turn the key you should hear a slight hum from the fuel pump. If such a buzzing noise is not heard, it means there is no power to the fuel pump, there are problems with the wiring, etc.

We add that this method of determining the operation of the pump by sound is not suitable for all cars. On some models (especially premium ones), sound insulation is at a high level and the fuel pump turns on immediately after opening the driver's door, and not when turning the key in the lock. In this case, it may seem that the fuel pump does not work when the ignition is turned on, and the sound of the pump may simply not be heard.

Also in the general list of possible reasons why the fuel pump does not pump, the following are noted:

  1. failure of the fuel pump fuse;
  2. fuel pump relay failure;
  3. problems with the ground of the fuel pump;
  4. malfunction of the electric motor of the fuel pump;
  5. oxidation or damage to fuel pump contacts and terminals;
  6. the fuel pump itself is faulty;

How to check the performance of the fuel pump

Checking the condition of the fuel pump is carried out only in cases where certain signs of its malfunction are observed:

  • increased noise during pump operation;
  • the engine power has sharply decreased - the car cannot accelerate quickly;
  • The car does not start because no fuel is supplied to the engine unit.

You can determine that the cause of the malfunction lies in the fuel pump yourself. In addition, this does not require complex diagnostic equipment or special knowledge.

Initially, you need to check whether the pump itself is working. After the ignition is turned on, a slight buzzing noise should be heard under the rear seat cushion for a few seconds. If there is sound, it means the pump is working.

Pressure check

To check the pressure of the fuel pump, you will need a pressure gauge . It will need to be connected to the fuel system, which is located under the hood of the VAZ 2110/2112. A pressure gauge is connected to the fitting of the fuel pipe that goes to the engine. If at idle the device shows a pressure of more than 3.3 kg/cm3, then the fuel pump is clearly faulty.


When connecting, be careful not to damage nearby hoses and wires.

If the pressure gauge reading is less than 2.3 kgcm, then the problem in the fuel system lies not in the pump, but in another element - the filter.

Based on these indicators, you can immediately identify the nature of the problems in the fuel system

What to do if the pump does not pump fuel

In some cases, the problem lies in the fact that the fuel pump does not turn on. Accordingly, it will not provide gasoline to the power unit, and the car simply will not start.

Checking the functionality of the pump is as follows:

  • recline the rear seat in the cabin;
  • remove the hatch cover;
  • turn the starter on to crank, but do not start the car;
  • Connect a tester to the contacts of the fuel pump - if power is supplied, but the fuel pump does not pump, therefore, the device itself has failed;
  • if there is no power supply, the problem lies in the relay, fuse or wiring.

The easiest way to check the health of the relay and fuse is to replace them with new ones. If the fuel pump still does not work, there is a short circuit in the wiring.


Based on the diagram, you can identify the location of the malfunction

Causes of malfunction

The main causes of malfunctions of the VAZ 2110 fuel pump are the low quality of the fuel being filled, low fuel supply pressure, the regular presence of a small amount of gasoline (less than 5 liters) in the fuel tank and improper operation when starting the engine - before starting the engine, you must wait after turning on the ignition 2-4 seconds to pump fuel into the engine power system.

It is also possible that the fuel pump as a part will naturally fail, depending on the mileage of 150 - 200 thousand km. or for a period of 4-5 years, but again this malfunction depends on the operating conditions of the car itself. Usually the factory fuel pump is replaced with a BOSCH one.

There are secondary malfunctions of the VAZ 2110 fuel pump failure - failure of the relay, blown power fuse, they are located in the fuse mounting block either under the hood or in the lower left part of the dashboard, front console, depending on the engine modification, and contamination of the fine filter mesh fuel cleaning (located directly on the fuel pump).

These faults can be fixed relatively quickly and without large financial investments. Fuel pump repairs are performed quite rarely, and the cost of repairs relative to the cost of the pump is insignificant.

Replacing the fuel pump

The replacement process is quite easy. Just follow the instructions and you'll finish the job in no time.

  • Disconnect battery power.
  • Unscrew the fuel pump cap.
  • Remove the connectors from the fuel pump.
  • Loosen the clamp slightly, which is located directly on the fuel hose. It makes no sense to remove it completely.
  • Unscrew both hoses through which fuel is supplied.
  • Remove the gaskets. It is better to immediately replace them with new ones. These are consumable, cheap materials.
  • The fuel pump is secured with 8 bolts. Unscrew them all and save the bolts.
  • Remove the O-ring.
  • Remove the fuel pump along with the float.
  • Remove the seal, which is made of rubber.
  • Replace the new fuel pump.
  • Reassemble in reverse order.

It is hardly worth trying to repair an old fuel pump. It is difficult to vouch for the quality of the repairs performed, since one malfunction may lead to others. There is no point in taking risks. In addition, a new fuel pump is far from the most expensive pleasure for a VAZ 2110.

Doing the work yourself, the entire process of dismantling and installing the pump will take you about 20-30 minutes.

Follow the instructions, avoid any attempts at amateur activities. Please note that the cost of such a procedure at a service station will be even more expensive than purchasing the newest electronic fuel pump. Therefore, spending money on this makes no sense if everything can be done yourself.

The good thing about the VAZ 2110 is that the cost of its parts is incredibly affordable for domestic consumers. Plus, the design of the machine is quite simple, which allows you to carry out a number of repair work yourself, without fear of the consequences of incorrect repair.

Please note that if you do not have any experience in car repair and maintenance, it is not recommended to start your practice with such an activity as replacing a fuel pump. Practice on simpler tasks and over time you will learn all the joys of doing your own repairs.

Here's the thing - the car won't start. Unfortunately, this problem is often present among drivers of the VAZ 2110. And this is connected with nothing other than the fuel pump. Today, replacing a VAZ 2110 fuel pump is the most common type of repair. And a fuel pump replacement for a VAZ 2110, as this type of repair is called in auto repair shops, can be easily carried out on your own.

Characteristics of the Bosch VAZ 2110 fuel pump (pressure and performance)

The topic is open to those who are looking on the Internet for information about the technical characteristics of the Bosch fuel pump for the VAZ 2110. If you were looking for information about the fuel pumps for the VAZ 2110 Bosch, then this is an incorrect request.

Fuel pumps most often mean high-pressure fuel pumps, also known as injection pumps, and this is closer to diesel fuel systems. Gasoline engines have fuel pumps - mechanical and electric.

On the VAZ 2110, the Bosch electric fuel pump is probably the most popular fuel pump, because it has a relatively low price and universal dimensions, as well as availability in most stores.

How to choose a good quality Bosch fuel pump?

Let's start in order, and also explain how to check the quality of a Bosch fuel pump without installing it on a car and installation precautions.

Bosch fuel pump performance - from 3 to 3.8 bar

The manufacturer Bosch produces its own fuel pump for each type of fuel system. Why, after the original fuel pump fails, do people install a Bosch fuel pump from a VAZ 2110? How does the pressure and performance of the fuel pump compare with the original one? If you put it with high pressure, will the flow rate increase?

Consumption does not increase due to the performance of the fuel pump, since on cars the return line is activated and excess fuel is returned to the tank, there is also a fuel pressure regulator, from the name it is clear, I think what function it performs.

Consequently, there was a 2.8 bar pump, they installed a Bosch VAZ 2110 fuel pump with 3.8 bar and it will only get better. Fuel consumption may increase if the fuel pump does not create sufficient pressure in the rail and the injectors begin to pour gasoline, which does not burn, rather than spray.

Characteristics of the Bosch fuel pump 0580453453

Especially for my readers, I got confused and measured the fuel pump that is on my display case. In fact, the characteristics of Bosch gasoline pumps differ in the length and very rarely in the diameter of the body. Why? The diameter of the body can be adjusted using a gasket made of petrol-resistant rubber.

Most often, the characteristics of fuel pumps (not only Bosch, but also from other manufacturers) may differ in length, pressure, location of terminal chips and that’s it :). The fuel pump mesh does not differ in seating, but it may differ in shape.

The chip for the terminal can be remade or supplied from the same VAZ. The length of the fuel pump is important, since its operation depends on this when the fuel level in the tank is low, and if it is in the module, then you need a match to install it.

Fuel pump length:

  • Bosch fuel pump 0580453453 - 105 mm
  • Bosch fuel pump 0580453449 - 65 mm
  • Bosch fuel pump 0580453465 - 90 mm

How to buy a good quality Bosch fuel pump?

On the market, a Bosch fuel pump costs half as much as mine. I will provide more accurate information, the retail price of a Bosch VAZ 2110 fuel pump on the market or in unscrupulous stores is $10 cheaper than purchasing an original Bosch fuel pump.

I buy it roughly for 300 UAH, from an official supplier and I know that this is the original, and a fake Bosch fuel pump is sold for 220-250 UAH at retail.

Submersible fuel pumps are lubricated and cooled by fuel. Due to low-quality gasoline and additives, internal electrical mechanisms are corroded. When working dry, the brushes overheat and wear out. The service life of the fuel pump is very long.

There were foreign cars that, after more than 25 years, decided to change the fuel pump, only for the reason that it began to pump poorly, such a car was a 1986 Honda Accord 2.0. It was amazing for me to hear when my grandfather, who is also the driver of this car, told me how he tested it.

He says, I take a jar, pour some water, turn it on the battery, I see the stream is weak, and I realized that he is already old. The pump was original, I personally held it in my hands. The pressure created by the fuel pump can reach 6-7 atmospheres; the Bosch fuel pump with the VAZ 2110 operates with this power.

Model selection

It is best to install an imported fuel pump on the VAZ 2110 injector, capable of delivering a performance of up to 7 atm. It will not only last much longer, but will also ensure better and longer operation of the injector and improve the quality of the mixture at the outlet of the nozzle.

You should know that Bosch fuel pumps usually differ only in length, location of terminal connectors, and sometimes in the diameter of the housing. Therefore, it is advisable to either go shopping with an old device, or make some minor modifications at home.


Bosch fuel pump

To avoid buying a fake, keep in mind that any Bosch gas pump is packaged in very durable packaging. The bag contains purified gasoline in which the device is immersed. If you smell it, it means the seal is broken, corrosion may begin inside the pump, it’s better not to buy one.

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