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Checking fuel pump capacity

Checking fuel pump capacity

Warning

Checking the capacity of the fuel pump involves partial dismantling of the car's fuel system. The following points must therefore be observed in connection with this work:

• Work only in a well-ventilated area. If approved equipment for the extraction of fuel vapours is available, be sure to use it.

• Wear suitable gloves. Prolonged contact with fuel can cause skin irritation or dermatitis.

• Keep a class BE fire extinguisher near at hand. Be mindful of the danger of sparks caused by short circuits and when connecting and disconnecting leads in electrical circuits.

• No smoking anywhere in the vicinity,

• Wear protective goggles.



1. Reduce fuel pressure by removing fuel pump fuse no. 19 while the engine is idling. Turn off the ignition once the engine has stopped and replace the fuse.


2. Remove the engine cover.

3. Detach the return line from the fuel rail.

4. Connect the adapter and hose, tool 83 93 183, to the return of the fuel rail. Place the hose end into a collecting vessel.


5. Run the fuel pump with the diagnostic tool for 30 seconds.



During 30 seconds of operation the pump should deliver at least 700 ml of fuel to the receptacle.