Diagnostics, repair and replacement of the fuel pump on carburetor and injection VAZ 2108/2109

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If the fuel pump on a VAZ 2109 malfunctions, the fuel supply to the carburetor is completely or partially stopped. Therefore, it is not possible to start the engine cold or hot. It will start at first, but then immediately die. Plus, instability at idle is often observed.

Before changing the fuel pump, it is recommended to first check the condition of the device. It is not uncommon for a breakdown to be corrected with minor repairs.

What fuel pumps were installed on VAZ 2108/2109 cars

Most VAZ 2108/2109 cars were equipped with gasoline engines with carburetor injection of a combustible mixture into the combustion chambers. Only their latest modifications were equipped with fuel injection systems.

Table: serial engines of VAZ 2108/2109 cars

Absolutely all carburetor “eights” and “nines” were equipped with DAAZ mechanical fuel pumps produced by the Dimitrovgrad Automotive Accessory Plant. They were and are now produced under catalog number 2108–1106010.

Mechanical fuel pump DAAZ 2108–1106010

VAZ 2108/2109 injection engines were equipped with electric submersible gasoline pumps produced by Russian enterprises Pekar, Utes, SAAZ, as well as pumps of joint and foreign production. Fuel pumps were installed on the latest modifications. The catalog number of the submersible electric fuel pump VAZ 2108/2109 is 2112–1139009.

Electric pump "Bosch" 2112–1139009

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.

Features of the design and location of fuel pumps VAZ 2108/2109

The DAAZ gasoline pump has a simple mechanical design. It includes:

• a body consisting of an upper and lower part;
• lid;
• mesh filter;
• valves (inlet and outlet);
• diaphragms (3 pcs) with spacers;
• the rod to which the diaphragms are attached;
• return spring;
• manual pumping lever.

  
  Design of the DAAZ fuel pump

The VAZ 2108/2108 mechanical fuel pump is located in the engine compartment of the car and is installed on the auxiliary drive housing (in front of the ignition distributor). It is driven by the camshaft through a cam mechanism and a rod (pushrod). The camshaft rotates an eccentric, which transmits force through a pusher to a balancer at the bottom of the pump housing. The latter raises and lowers the rod with the diaphragms. Thus, a vacuum is formed at the pump inlet, and pressure is formed at the outlet. Valves located in the device body are responsible for its maintenance.

The VAZ 2108/2109 mechanical fuel pump is located on the auxiliary drive housing

On injection VAZ 2108/2109, the fuel pump is not a separate device, but an element of the fuel module. It also includes:

• plastic storage cup;
• coarse mesh filter;
• fuel level sensor.

  
  Fuel module assembly

The module is located in the car tank. Its lid (base) is located at the top of the container. You will find it by removing the back seat and peeling back the carpet.

The electric fuel pump in the injection VAZ 2108/2109 is located in the car tank

Structurally, the fuel injection pump VAZ 2108/2109 is an electric motor with an impeller on the shaft, which, rotating, pumps gasoline, creating a vacuum at the inlet fitting and pressure at the outlet. The pump is powered from the machine’s on-board network, protected by separate relays and a fuse.

Design of the electric fuel pump VAZ 2108/2109

An article dedicated to self-repair and replacement of the gas tank on a VAZ 2109 is located here:

Disassembling and replacing the fuel pump

So, now we’ll tell you specifically about how to properly disassemble, replace damaged elements of the fuel pump, or completely replace this device with a new one.

Hatch

1. In any case, we recommend purchasing a repair kit. It doesn't cost much. But there is no need to rush into buying a fuel pump. Who knows, maybe a simple repair will bring the pump back to life.
2. Remove the air filter along with its housing.
3. Disconnect the fuel supply and return hoses from the fuel pump fittings.
4. Unscrew the mounting nuts that hold the pump itself.
5. Carefully remove the pump, being careful not to damage the gaskets.
6. Inspect the pump parts for cracks or damage. Check the fuel pump valves for leaks and perform all the operations we described above.
7. Assess the current condition of the suction and discharge fittings. When dismantling, they must remain motionless in their seats. They break extremely rarely, but nothing should be ruled out.
8. Check the fuel pump diaphragm. The presence of ruptures and peelings indicates that it must be replaced.
9. Look at the current filter. Damage and excessive contamination are clear signs of wear and warrant replacement.
10. Treat the filter components with clean gasoline and blow with compressed air using a compressor.
11. If you find damaged elements, replace them with new ones using a repair kit.
12. Replace the pump gaskets if necessary.
13. When installing new gaskets, be sure to first treat their surface with Litol 24.
14. If the pump housing itself is damaged or there are other serious problems, you will have to completely replace the fuel pump. Repairs won't help him.
15. Next, when partial repairs are completed or you decide to take a completely new pump, it’s time for reassembly.
16. Be sure to adjust the feed using shims of the required thickness so that the pusher output has an optimal indicator. We talked about this above.
17. If the pushrod protrudes too much, it will cause the fuel pressure to be too high, causing your carburetor check valve to break.
18. If the distance is less than required, as the load increases and the vehicle speed increases, the engine will not be able to receive enough fuel.
19. Reassemble by following the reverse sequence of dismantling the fuel pump.
20. Make sure the arrow on the body points towards the carburetor.
21. When installing the diaphragm pump assembly, the holes in the gasket are located away from the muffler pipe.

Well, you figured out how you can repair and replace the fuel pump yourself. The task is really not difficult, although this unit plays a very important role in the performance of the entire VAZ 2109 car.

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.

CONCLUSION

The VAZ carburetor electric fuel pump I installed works excellently and fully copes with its task. In just a few hours of work, I was able to overcome the problem that had plagued me for decades with the uninterrupted supply of fuel to the carburetor. If you have any questions, write to me in the comments and don’t forget to subscribe to content updates.

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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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