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 is driven by an electric motor in the pump assembly, causing the fuel in the tank to be drawn into the fuel pump inlet port. The fuel is then pumped out under pressure through the fuel feed pipe and hoses to the throttle body and the fuel injector. The fuel pressure is maintained when the fuel pump is not running by a pressure control valve located within the pump. Any excess fuel is returned to the fuel tank by the fuel return pipe and hoses.

Legend
1. Fuel Outlet Port
2. Check Valve
3. Magnet
4. Impeller
5. Pump Cover
6. Fuel Inlet Port
7. Bearing
8. Housing
9. Armature
10. Choke Coil