Fuel Pump Control - MRFS

The output signal from the PCM, FP, is used to control the electric fuel pump. With the EEC power relay contacts closed, vehicle power (VPWR) is sent to the coil of the fuel pump relay. For electric fuel pump operation, the PCM grounds the FP circuit, which is connected to the coil of the fuel pump relay. This energizes the coil and closes the contacts of the relay, sending B+ through the FP PWR circuit to the electric fuel pump. When the key is turned on, the electric fuel pump runs for about 1 second and is turned off by the PCM if engine rotation is not detected.