Circuit/System Description

The engine control module (ECM) enables the fuel pump relay when the ignition switch is turned ON. The ECM will disable the fuel pump relay within 2 s unless the ECM detects crankshaft reference pulses. The ECM continues to enable the fuel pump relay as long as crankshaft reference pulses are detected. The ECM disables the fuel pump relay within 2 s if crankshaft reference pulses cease to be detected and the ignition remains ON.

The fuel tank stores the fuel supply. An in-tank electric fuel pump supplies fuel from the fuel tank to the fuel filter assembly, which houses the water separator, fuel heater element with temperature sensor and a filter element. The fuel is then delivered to the high-pressure pump.