Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
- Fuel tank and fuel pump
   For what ventilation of a fuel tank is necessary?
   The sensor 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
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ 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 Audi A4 engines the fuel pump with the electric drive is inserted into the case of an inlet collector below in a fuel tank.
Positive current he receives via the relay of the fuel pump (head the Electrotechnical equipment). The scheme with blocking provides turning on of the pump only if the engine works. Information that the engine works, the relay receives from the control unit. The scheme with blocking should not allow ignition because of leakage of gasoline as a result of failure.

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

Six-cylinder engine:

1–retsirkulyatsionny pipeline;
2–submitting топливопровод;
3–regulator of pressure of fuel.

Search of malfunctions in the fuel pump with the electric drive

First of all check a safety lock (head the Electrotechnical equipment). If it as it should be:


  1. Sometimes by listening it is possible to receive information, whether the pump works: listen under the car at height of a fuel tank, whether the pump when your assistant includes ignition turns on for short time.
  2. If the sound of operation of the pump, that, possibly, it as it should be is heard. If you hear nothing, check, whether fuel moves:
  3. Dismantle submitting or retsirkulyatsionny gasoline pipe line and lower it in capacity.
  4. Even at the idle engine a little fuel as in fuel system there is a certain residual pressure should act.
  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 the mnogoshtyrkovy socket 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 the mnogoshtyrkovy socket.
  11. The voltmeter or control lamp check, whether there is a tension about 12 In between socket 1 and 4 contacts (a brown and green/yellow wire). To carry out measurement, your assistant should put in action a starter (the gear shifting lever in neutral situation, is switched on the hand brake).
  12. If, despite the correct tension, the pump does not work, it is faulty – dismantle and replace it.
  13. If there is no tension, the relay is possible, faulty. About its check see in head the Electrotechnical equipment.
  14. Among other sources of malfunctions it is necessary to call: defect in a wire to the relay or to the pump, got littered or will bend a gasoline pipe line, the main filter got littered.