Fuel Pump: Description and Operation

Fuel Pump - Exploded View:

The fuel pump is mounted on the fuel sending unit assembly inside the fuel tank. The pump assembly includes a check valve located at the fuel pump outlet. The function of this valve is to maintain presure in the system after the vehicle is shut down. The pressure retention helps prevent hot starting problems. A pressure relief valve is provided to regulate the maximum fuel pump outlet pressure.
The fuel pump is protected at its inlet by a filter element. This element filters dirt and contaminants which could plug or damage the internal pump components.