Fuel Pump Control - EcoSport And KA
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2017 Lincoln Navigator, 2017 Lincoln MKZ, 2017 Lincoln MKX, 2017 Lincoln MKT, and 2017 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
The output signal from the PCM or BCM controls the electric fuel pump. With the PCM power relay contacts closed, VPWR is sent to the coil of the fuel pump relay. For electric fuel pump operation, the PCM or BCM 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 FPPWR circuit to the electric fuel pump. When the ignition is turned ON, the electric fuel pump runs for about 1 second and is turned OFF by the PCM or BCM if engine rotation is not detected.