Fuel Delivery: Operation

The fuel system provides fuel pressure by an in-tank pump module. The Powertrain Control Module (PCM) controls the operation of the fuel system by providing battery voltage to the fuel pump through the fuel pump relay. The PCM requires only three inputs and a good ground to operate the fuel pump relay. The three inputs are:

1. Ignition voltage
2. Crankshaft Position (CKP) sensor
3. Camshaft Position (CMP) sensor