Fuel Pump: Description and Operation

OPERATION
The electric fuel pump is controlled by the Powertrain Control Module (PCM) through a fuel pump relay. It is an electric high pressure roller vane pump which is mounted to the fuel sender assembly inside the fuel tank. The fuel is pumped to the engine at a specified volume and pressure by the fuel pump. Excess fuel is returned to the fuel tank via the return line. The fuel pump delivers a constant volume and pressure of fuel to the engine even during low fuel conditions and aggressive vehicle maneuvers.

A woven plastic fuel pump strainer is attached to the lower end of the fuel pump in the fuel tank. The functions of the fuel pump strainer are to filter contaminants and to wick fuel. The life of the fuel pump strainer is generally considered to he that of the fuel pump. The fuel pump strainer is self-cleaning and normally requires no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or water. In which case the tank should be thoroughly cleaned. If the fuel pump strainer is plugged, replace it with a new one.