Fuel Pump: Testing and Inspection

NOTE: In order to perform this test, fuel filter and voltage supply must be adequate.

1. Remove heater fan from left-hand rear engine compartment area.




2. Undo fuel return pipe from branch piece, using a second wrench to lock. Drain remaining fuel into a suitable container.







3. Connect Special Tool, connecting hose 9507, Part No. 000.721.950.70, and route it into a fuel measure.




4. Pull DME relay (R53) off the Central Electrical System and use a fuse-protected shop- made jump lead to connect pin 30 to pin 87 b (identifications 3 and 7 on Central Electrical System). The fuel pump should now operate.

5. Allow fuel to drain into a fuel measure for 30 seconds.

Minimum fuel delivery 850 cc/30 sec, i.e. at least 850 cc of fuel should have collected in the fuel measure after 30 seconds have elapsed.