Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
- Fuel tank and the fuel pump
   For what ventilation of a fuel tank is necessary?
   The gauge of the indicator of level of fuel in a fuel tank
   The fuel pump with the electric drive
   Dismantle of the petrol pump with the electric drive
   Replacement of the fuel filter
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

The fuel pump with the electric drive

In all versions of engines Audi A4 the fuel pump with the electric drive is inserted into the case of an inlet collector below in a fuel tank.
Positive current it receives through the relay of the fuel pump (the head the Electrotechnical equipment). The scheme with blocking provides pump inclusion only in the event that the engine works. The information volume that the engine works, the relay receives from the management block. The scheme with blocking should not suppose ignition because of leak of gasoline as a result of failure.

Here it is checked, whether submits the fuel pump gasoline. For this purpose рециркуляционный the hose (2) is disconnected in a junction. Put on a hose on submitting топливопровод (1) and lower it in capacity.

The six-cylinder engine:

1 – рециркуляционный the pipeline;
2 – submitting топливопровод;
3 – a regulator of pressure of fuel.

Search of malfunctions in the fuel pump with an electro-drive

First of all check up a safety lock (the head the Electrotechnical equipment). If it is perfectly in order:


  1. Sometimes by listening it is possible to receive the information, whether the pump works: listen under the car at height of a fuel tank, whether the pump when your assistant includes ignition joins for short time.
  2. If the sound of work of the pump, that, possibly is heard, it is perfectly in order. If you hear nothing, check up, whether fuel moves:
  3. Dismantle submitting or рециркуляционный a gasoline pipe line and lower it in capacity.
  4. Even at the idle engine should act a few fuel as in fuel system there is a certain residual pressure.
  5. If is not present, a way your assistant will put in action a starter.
  6. Now the fuel pump should submit fuel.
  7. If it is not present, it is necessary to check up многоштырьковый I will corrode above on a deaf flange of a fuel tank, whether the current to the pump arrives in general:
  8. Cast away a floor covering of a luggage carrier.
  9. Unscrew a black cover.
  10. Disconnect многоштырьковый a socket.
  11. The voltmeter or control lamp check up, whether there is a pressure nearby 12 In between contacts of a socket 1 and 4 (a brown and green/yellow wire). To spend measurement, your assistant should put in action a starter (the gear change lever in neutral position, is included a manual brake).
  12. If, despite correct pressure, the pump does not work, it is faulty – dismantle and replace it.
  13. If there is no pressure, probably, the relay is faulty. About its check the Electrotechnical equipment see in the head.
  14. Among other sources of malfunctions it is necessary to name: defect in a wire to the relay or to the pump, has got littered or will bend a gasoline pipe line, the main filter has got littered.