Fuel Pump: Description and Operation

Fuel Pump Cross Section:

DESCRIPTION
The fuel pump is an electric pump that is controlled by the Powertrain Control Module (PCM) through the fuel pump relay. When the PCM commands the fuel pump to operate, an impeller turns with the motor in the pump assembly. This causes fuel within the fuel tank to be drawn into the fuel pump inlet port. Fuel is pumped out to the throttle body and fuel injector under pressure through the fuel feed pipe and hose. The fuel pressure is retained when the fuel pump is not running by means of a pressure control valve located within the pump. Excess fuel is returned to the fuel tank by means of a fuel return pipe.