Fuel Pump: Description and Operation

Fuel Pump:

The fuel pump is a submersible pump with a permanent magnet electric motor. Fuel enters the pump inlet tube after passing through a sock style filter and is pushed through the pump by the motor to the outlet. Voltage to the pump is supplied by the Auto Shut Down (ASD) relay. The pump contains a single check valve on the output side which restricts fuel movement in either direction, maintaining fuel system pressure at 100 kPa (14.5 psi), when the pump is not operating, and fuel pressure must be released prior to servicing the fuel system.