Fuel Pump: Testing and Inspection

Check volume supply of fuel pump.
1. Remove heater fan at rear left of engine compartment.
2. Remove fuel return line at fuel pressure regulator, making sure that you counter when you do this. Collect remaining fuel.




3. Connect special tool hose 9507, (Order No. 000.721.950.70) to pressure regulator and hold in a measuring vessel.




4. Disconnect ECM relay (R53) from fuse/relay panel and connect terminals 30 and 87 b (labeled 3 and 7 on fuse/relay panel) with locally manufactured fused jumper cable and trigger fuel pump with system tester. The fuel pump must work now.
5. Allow fuel to flow into a measuring vessel. Fuel volume supply must be at least 850 cm3/30s, i.e. after these 30 seconds, the measuring vessel must contain at least 850 cm3 fuel.

WARNING: Observe the safety regulations under all circumstances.