Fuel Pump: Description and Operation

Secondary Fuel Pump, Function

The electric Fuel Pump (FP) operates the secondary fuel pump in the left chamber of the fuel tank.

The fuel pump creates an operating stream that is pressed into the secondary fuel pump via a jet which causes acceleration. This acceleration causes the fuel in the left chamber of the fuel tank to be drawn into the right chamber of the fuel tank.

Disturbances caused by a faulty secondary fuel pump

WARNING: When the secondary fuel pump is faulty, the vehicle may not run if the fuel tank is about 1/4 full.







If the secondary fuel pump -2- is not functioning, up to 15 liters of fuel -3- (up to about 1/4 of tank capacity) can remain in the left portion of the fuel tank that cannot be drawn out by the Fuel Pump (FP).

If the vehicle will not run due to lack of fuel although the tank is about 1/4 full, proceed as follows:
- Check Fuel Pump (FP).

If the Fuel Pump (FP) is OK, but no fuel is being pumped:
- Add about 5 liters of fuel to tank.
- Start engine.

If the engine starts now:
- Replace secondary fuel pump.