Fuel Pump: Testing and Inspection

CHECKING FUEL PUMP CAPACITY






1. Open the glove compartment and remove the cover over the fuse board. Connect LH diagnostics cable 83 93 886 between +30 and the positive side of the fuse to the fuel pump so that there is voltage to the pump.

2. Switch the switch to "OFF". Disconnect the return hose from the pressure regulator.

3. 4 Cyl:
Fit a test hose (part No.83 94 405) to the return flow. Place the free end in a 2 1 measuring beaker.

6 Cyl:
Connect adapter with hose (special tool No. 83 94 744) to the fuel rail return. Place the hose in a receptacle.

4. Start the fuel pump by turning the switch to "ON". Measure the flow capacity of the fuel pump by allowing it to run for 30 seconds. The volume of the Bosch pump should be 0.9 1 and the Waibro pump 0.7 1.

Important: During all work that involves the disconnection of the fuel line, great care must be taken with cleanliness.