Fuel Pump: Description and Operation

FUEL DELIVERY MODULE




The fuel delivery module is installed in the fuel tank. The fuel delivery module consists of the following:
- Electric fuel pump
- Pressure regulator
- Fuel filter
- Fuel sender unit
- Fuel supply line connection


ELECTRIC FUEL PUMP
The electric fuel pump is located in the fuel delivery module. It is mounted with and connected to the fuel sender unit.

The fuel pump is an electric pump controlled by the engine control module (ECM) through the fuel pump relay. The motor rotates an impeller within the pump assembly. This causes fuel within the fuel tank to be drawn into the fuel inlet port. Fuel is pumped out to fuel injectors under pressure through the fuel pipes and hoses.

Fuel pressure is retained when the fuel pump is not running by means of a one-way check valve located within the pump.