Fuel Pump: Description and Operation

Fuel Pump:

An electric fuel pump located in the modular sender assembly is used to provide fuel pressure. To control fuel pump operation, a fuel pump relay and fuel pump switch are used. When the ignition lock cylinder is turned to RUN position, the fuel pump relay activates the electric fuel pump for approximately two seconds to prime the injectors. If the PCM does not receive reference pulses after this time, the PCM opens the fuel pump relay ground circuit. The relay will reactivate the fuel pump when the PCM receives reference pulses.