How to check the fuel pump on a VAZ 2109 injector

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.

Work process

Electric fuel pump for VAZ 2110

The driver turns on the ignition switch, a signal is sent from the on-board computer to the electric motor of the pump, in which an electric charge occurs. A motor starts working inside the pump itself, creating a working pressure level in the fuel supply system in a few seconds. After three seconds, the on-board computer does not give a signal to start the engine, and the pump motor automatically turns off. At this time, you can hear the operation of the electric fuel pump. In the first seconds of the pump starting to operate, gasoline enters it through the tube. The fuel exits through a special one-way valve installed by the manufacturer, which traps debris and impurities.

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.

how to replace it yourself

Fuel pump in VAZ 2110/2112: self-diagnosis and replacement
Fuel pump "nine"

Probably all owners of domestic cars have encountered a situation where the car cannot be started after some inactivity. The battery is working properly, the starter vigorously cranks the crankshaft, but the engine does not want to start.

This can happen for 2 main reasons: either there is no spark, which means that the ignition system does not work, or the combustible mixture is not supplied and, accordingly, the engine power system does not work.

We will talk about malfunctions of the fuel supply system. Let's consider a situation when the engine does not start because the VAZ 2108-15 fuel pump does not work. We will also learn how to replace the fuel pump of a VAZ 21099 car with your own hands.

Malfunctions, removal and repair of a mechanical fuel pump

On VAZ 21099 cars, the carburetor was equipped with mechanical diaphragm-type fuel pumps by the manufacturer. The main malfunctions of this type of pump are associated with rupture of diaphragms, breakage of the rod, spring and depressurization of valves.

The main advantage of mechanical fuel pumps is that they are easy to repair. If any element fails, you can buy a domestic repair kit at the nearest spare parts store and replace all faulty parts within an hour. The fuel pump on VAZ 2108-99 cars with a carburetor fuel supply system is located in the engine compartment, in the same place where the ignition distributor is located.

Removing the mechanical fuel pump.

First, open the hood and remove the negative terminal from the battery.

Then loosen the clamps and disconnect the fuel hoses from the pump pipes

After this, unscrew the 2 nuts securing the fuel pump and carefully, so as not to damage the gaskets, remove it

Now it needs to be disassembled.

Unscrew the bolt on the top of the pump cover and remove it along with the strainer. Unscrew the 6 screws and separate the upper and lower parts of the case

Carefully remove the diaphragms along with the spring and rod, turning them 90°

After disassembly, it is necessary to carefully inspect all parts and replace damaged ones. Reassemble and install the pump in reverse order.

Electrical faults and replacement

Submersible electric fuel pumps were installed by the manufacturer on VAZ 21099 injector cars. Unlike their mechanical counterparts, these units are not dismountable, so they cannot be repaired. Mostly, such fuel pumps break down due to overheating and the use of low-quality fuel. In addition, very often faults arise not in the unit itself, but in its wiring.

If the electric fuel pump on your car hums and stops pumping fuel, you first need to check the serviceability of the electrics. Perhaps the wiring has shorted, the fuel pump relay has broken, or the fuse has simply blown. If the electrical is OK, the fuel filter needs to be replaced. If this does not help, then you need to change the pump itself. Please note that the VAZ 2108-15 electric fuel pump is located in the fuel tank, so to replace it you will have to crawl under the car.

The procedure is as follows.

First, drive the car onto a pit or lift.
Then remove the negative terminal from the battery.
Then remove the back seat and find the place where the inspection hatch is located. Unscrew the screws securing its cover and move it to the side.
Disconnect all wiring terminals from the fuel pump and fuel sensor.
Unscrew the nut securing the fuel supply pipe and move the pipe itself to the side.
Find the drain pipe fitting under the bottom and unscrew it.
Next, remove the gas tank.
Unscrew the fuel line tip nut and disconnect it from the fuel pump.
Unscrew all fastening nuts, remove the sealing ring and remove the electric fuel pump together with the storage cup from the fuel tank.

Reassembly must be done in reverse order.

Note: to prevent gasoline from spilling out of the fuel lines, after the 4th operation you can connect the battery and start the engine. After 4-5 minutes, the engine will exhaust all the gasoline remaining in the system.

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.

Where is the temperature sensor located?

If the temperature sensor does not show on the instrument panel, there is a high risk of overheating the engine, since the instrument panel does not inform the driver about the heating of the internal combustion engine coolant. Of course, the instrument panel or electrical wiring may be faulty, but most often the temperature sensor (DTOZH) on the engine itself refuses to work.

Where is the temperature sensor located on an injection car 099? Of course, you need to look for it in the engine compartment:

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.

The car won't start, but when you turn the ignition key you can't hear the fuel pump running? Don’t rush to replace it with a new one; it’s better to first find out how to check the operation of the gas pump yourself.

Procedure : 1. Check the fuel pump fuse. This is where you should start checking the fuel pump. On a VAZ 2110 it is located near the left foot of the front passenger.

2. How to check the fuel pump relay. The relay is located next to the fuse, so let's check that right away. We check the voltage at the control terminals one by one (87, 86 and 85 in turn), and touch the ground with the other end. The testing tool can be a multimeter or a test lamp with a current consumption of no more than 0.25A. If the lamp does not light and the fuse is good, then we check the wiring and serviceability of the ECU.

Sometimes they check differently, for example, instead of a relay, they connect a test lamp between pins 85 and 86. When the ignition is turned on, the lamp should light up. You can also place a jumper between pins 87 and 30. Does the fuel pump start when you turn the key? This means the relay is faulty. You can also check the fuel pump relay by replacing it with a known good relay.

Tips for motorists

VAZ 2109 21099 2108

VAZ-2109 passenger cars of the last years of production had injection engines, so on these “nines” an electric fuel pump was installed in the fuel tank. And on a small part of the VAZ-2109 with a carburetor engine still in use today, mechanical fuel pumps were installed.

Failure to operate the fuel pump on VAZ-2109i injection engines is determined quite simply, since when the ignition key is turned to the “ignition on” position, the driver simply will not hear the characteristic noise that the running electric motor of the fuel pump makes. Typically, drivers of “nines” begin their search for the cause of a fuel pump failure by checking the condition of the fuse that protects this electrical circuit.

It is located under the front panel shelf, which is located below the glove compartment. When you unscrew the fastening screws, the block of three relays and three fuses on the wires will move lower, so it will be more convenient to work with it. You will need to check the rightmost fuse and the condition of its contacts. If a blown fuse is detected, it will have to be replaced with a new one. And also find the reason why he burned out.

If the fuse is intact and the contacts are not oxidized, then the next step in troubleshooting is to check the functionality of the fuel pump relay. It is located in the same block as the fuse and is located on the far right. Drivers usually check it by replacing it with a known-good relay. If after such a replacement the fuel pump starts working, then you will have to purchase and install a new relay.

But when the fuel pump still continues to be “silent”, then you will need two wires four meters long. They are needed to check the condition of the fuel pump itself by connecting it to power directly from the battery. To do this you will need to: lift the rear seat cushion, remove the hatch cover, disconnect the plug block and connect the wires from the battery to the fuel pump terminals. There are three terminals in the block: one for ground, the negative one from the battery is connected to it, two more positive ones, for the fuel pump and the fuel level indicator in the tank.

If the fuel pump, when connected directly, works, then you will have to ring the wires going from it to the fuel pump relay, and if it does not work, then either replace it with a new one, or you will have to disassemble it and look for a fault inside the fuel pump.

On “nines” with a mechanical fuel pump, the most common malfunction is wear of the fuel pump diaphragm, as a result of which gasoline will leak through the drainage hole in the housing when it operates. The second reason for the failure of such a fuel pump is wear of the pusher, which transmits force from the camshaft cam to the fuel pump drive lever.

Restoring the fuel line and replacing the fuel pump VAZ 2109

The VAZ 2109 fuel pump is an important component of the car. He is responsible for transporting gasoline along the fuel line from the gas tank to the engine compartment. The VAZ 2109 fuel pump injector is an electrical device, while in the carburetor version this element is mechanical.

Often the fuel pump is the reason the engine fails to start. The fuel injector or carburetor does not receive fuel in the required quantity, and the “nine” simply does not start. To understand the cause of the malfunction, you need to know the design of the pump, check all parts of the fuel pump for integrity and functionality.

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:

fuel pump relay VAZ 2109;
fuse;
voltage to the pump;
wires from the mounting block to the pump;
pressure in the fuel rail.

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.

Possible situations and your actions

We take a voltage indicator and check the serviceability of the relay and fuse, which are located in the mounting block.

If the electrical circuit connection diagram is in order, you need to check the voltage supply directly to the pump. To do this, we dismantle the rear seat of the Lada 2109 car. Under it there is the top cover of the pump and the connected wire connector from the mounting block, and the fuel line hose is also supplied here. We disconnect the contacts and unscrew the bolts on the cover.

Now you have direct access to the pump. We remove the fuel pump from the gas tank.

We measure the voltage at the fuel pump using a multimeter (tester) or a 12-volt light bulb. If the device shows that voltage is supplied to the VAZ 2109 fuel pump, the problem is not electrical. This means that the fuel system should be checked. Well, if there is no voltage, you don’t have to worry about the pump malfunctioning. Just check the integrity of the wire leading from the mounting block to the pump for damage.

On a fuel-injected "nine", the fuel level in the gas tank should be maintained at least 10 liters. This is done to ensure that the fuel pump does not suck in air under any circumstances. We check the serviceability of the pump by measuring the pressure in the fuel rail.

We connect the device to a special hole in the ramp. If the voltage is normal and the pressure gauge shows no pressure, the problem may be in the fuel filter. We check its integrity and throughput. If the filter is working properly, we check the fuel line leading from the gas tank to the ramp.

If all these parts are in good working order, we conclude that the fuel pump itself has failed. Having replaced the pump with a new one, we connect it and try to start the car. If the car starts, the problem really was in the pump. If the engine fails to start, the fuel system should be checked more carefully.

In the absence of a pressure gauge, the performance of the gasoline pump is checked by the amount of gasoline pumped per unit of time.

This check can be performed by connecting a hose to the ramp and lowering it into a container. We wait and let the fuel flow into the container for one minute. Then we check the volume of fuel in the container. It should be from 0.5 to 1 liter.

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.

Malfunctions of the pump with carburetor

Repairing the VAZ 2109 carburetor fuel pump should also begin with diagnostics. But in this regard, there is a significant difference from the injection version of the car. It lies in the fact that the fuel pump, in this case, is mechanical. The principle of operation, and therefore the repair, is different. Diagnosis involves the following basic steps when checked:

general condition of the fuel pump;
intake and exhaust valves;
tightness;
filter for clogging or damage;
pump diaphragm;
pusher

VAZ mechanical fuel pumps come in two types: DAAZ and Pekar. The principle of operation is similar, there are slight differences in design. The main parts of all mechanical pumps are: inlet and outlet valves, fittings, pusher, diaphragm and rod.

To check the inlet valve, you need to disconnect the hose from the suction fitting. Close the fitting with your finger and pump up the pump manually. If the finger is attracted to the valve, everything is in order - this part is serviceable; if not, the valve must be replaced. The outlet valve is checked by unscrewing the discharge fitting. By placing your finger in the same way and pumping up the lever, you should feel pressure.

Operating principle of a mechanical fuel pump

The fuel pump is driven by the camshaft cam, which moves the pusher in a horizontal direction, causing it to perform reciprocating movements. The pusher, in turn, acts on the mechanical pumping lever, and it already raises and lowers the membrane rod.

Thus, a certain pressure is created inside the fuel pump, which is maintained by the valves of the device cover. One of them lets fuel in without letting it back in, and the second pushes it into the fuel line going to the carburetor.

As you can see, the design is very simple, therefore, to determine the reason that the fuel pump does not pump, it is enough to disassemble it and check the condition of the main elements.

Since the housing does not affect the operation of the fuel pump in any way, unless it is damaged, of course, we will start with the pusher. This element is made of steel and cannot simply break. But wear and tear is welcome, especially if it is not original, but purchased as a separate spare part. As soon as its length decreases by a few millimeters, the fuel pump does not pump fuel.

Or rather, it pumps, but the amplitude of movement of the diaphragm is significantly reduced. This results in low fuel pressure in the system, and, as a result, interruptions in engine operation. The standard pusher length for DAAZ pumps is 84 mm. Measure its length and, if necessary, replace the worn part.

The most common malfunction of the diaphragm is its rupture. It also happens that it becomes deformed. Due to this damage, the diaphragm begins to leak fuel through itself, which also causes a drop in pressure in the system.

Such a malfunction can only be detected by disassembling the fuel supply device. If the diaphragm is to blame for the fuel pump not pumping, you will see it immediately. This problem is solved by replacing it.

Checking the pump characteristics

As you can see, the main reasons for a non-working fuel pump are valves, filters, hoses, and diaphragms. At the outlet we get insufficient pressure. How to measure this pressure, and within what limits is the norm? Firstly, you need to know exactly the nameplate value of the output pressure to the carburetor of your car at idle speed. Approximately the indicator should vary from 0.2 to 0.35 atm.

Measurements are carried out using a pressure gauge with a division value of 1.6 atmospheres. If the pressure is not much less than normal, replacing individual parts may help solve the problem. But if there is a significant deviation, the VAZ 2109 fuel pump will most likely need to be replaced. Timely maintenance and rational use help to avoid this.

In addition to the pressure indicator, in order to repair a part, you should know the characteristics of the pump itself. If the linear parameters have changed, the tightness and stability of the entire mechanism may be impaired.

The rod must have a length of 82.4 mm and protrude above the gasket by no less than 0.8 mm and no more than 1.3 mm. The thickness of the closest gasket is 0.3 mm. The stroke of the rod should be in the range from 2.5 to 2.8 mm.

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

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?

Let's turn off the power to the car;
Remove the rear seat;
We lift the car on lifts;
Remove the seat;
Unscrew the soundproofing sheets;
Unscrew the screws securing the hatch;
Remove the hatch;
Disconnect the connectors with power cables from the fuel level sensor and from the part;
Unscrew the nuts that secure the fuel supply pipes;
Unscrew the fuel drain pipe fitting;
Disconnect the wire;
Remove the fuel tank;
Disconnect the wire from the fuel pump;
Unscrew the nuts;
Remove the pressure ring;
Take it off;
Remove the sealing gasket;
Replacement is completed and reassembly is carried out in reverse order.

How does a fuel pump work?

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.

How to remove the fuel pump

Reasons for fuel pump failure

The pump can fail for various reasons:

For carburetor engines, the main source of the problem is usually the fuel pump rod. During operation, it becomes shorter and the pump stops supplying the required amount of fuel to the engine.
The device may stop functioning due to wear on the inlet valve or its O-ring.
Injection engines are equipped with electric fuel pumps. In this case, the most common cause of device failure is poor quality fuel. The inlet strainer becomes clogged with dirt and restricts the flow of fuel.
Electric pumps may become inoperable due to faulty wiring, relays, fuses, or terminal oxidation.

Some of these problems can be prevented by refueling with high-quality fuel at well-established gas stations. In addition, it is recommended to occasionally clean the gas tank and replace this and other elements of the fuel system when their service life has expired.

Checking the functionality of the relay

The fuel pump relay is a device that supplies or stops electrical power to the fuel pump. If it fails, the operation of the fuel system will stop.

Electrical power to the fuel pump is supplied through a relay

Checking the functionality of the relay and the corresponding one is carried out according to the following scheme:

Open the hood and remove the cover from the fuse and relay box.

Using your hands or special pliers, remove the relay and fuse that control the pump.

Inspect the relay and fuse and, if faulty, install new ones.

Check if current is flowing to the relay. This can be done with a wire with a 12 V lamp, connecting it to the connection point.

Often the relay stops working after installing an alarm system on the car. In this case, you should reset all settings from the alarm key fob.

Video: checking relay functionality

The mechanism works, but does not pump fuel

Sometimes the device makes a characteristic hum, but gasoline is not supplied to the engine. The fact is that the pressure in the fuel system should not exceed 3 atm. It can be measured by connecting a pressure gauge to the fuel rail. If there is no pressure or it is very low, the element has failed.

It may happen that the device simply does not receive voltage. To check this, turn on the ignition and determine by ear whether the pump is working. It should make a slight buzzing sound. If nothing is heard, power is not supplied to the pump. Relays, fuses and wiring should be checked.

Video: what to do if the pump does not pump fuel

Pressure in the fuel supply system is not maintained

The pressure in the fuel system is maintained not by the pump itself, but by its check valve. Fuel enters through the inlet valve, which supplies it under pressure through hoses to the engine, and the check valve does not allow gasoline to return.

Due to severe wear, the check valve may not operate. As a result, the mechanism loses its ability to maintain the required pressure.

Depending on the make of the car, the check valve can be located either inside or outside the device body. Replacing a valve is a rather complicated procedure. Therefore, it is more convenient to replace the pump as a set.

The car jerks at low speed

If the engine begins to make unusual noises and jerk while driving at low speeds, the filter screen is most likely clogged. The pump simply does not have enough fuel to operate properly. The problem will go away after cleaning the mesh.

Similar symptoms may also be caused by incorrect operation of the device valves. Due to wear, they cannot pass gasoline in both directions. In this case, it is necessary to replace the mechanism.

Checking the pump's functionality

Pump installation

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