Checking fuel pump capacity, 4 cyl.

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.

Remove the engine cover.

Extract the fuel pump fuse no. 19 with the engine running. Switch off the ignition when the engine has stopped.

Undo the return hose from the fuel rail. Use the tool, part no. 83 95 261. Remove the seal on the quick-release coupling with flat pliers.

Important
In all work involving disconnection of the fuel line's quick-release couplings, great care should be taken to avoid damaging the sealing surface of the male coupling half. If the male coupling half is extremely dirty it should be cleaned before disconnection. Also clean the sealing surface after disconnection, if necessary. Use a soft cloth. Lubricate the male coupling half before fitting.

Connect the adapter with hose, part no. 83 94 918, to the fuel rail return. Lead the hose to a closed receptacle.

Run the fuel pump for 30 seconds, using the diagnostics tool.

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