Fuel Pump Control

The PCM controls in-tank electric fuel pump by energizing or de-energizing fuel pump relay. When ignition key is first turned to RUN position, PCM will energize fuel pump relay, by supplying power, for approximately two seconds to pressurize fuel system. If vehicle is started and received from EI module, fuel pump relay will be left energized. If engine is not started within approximately 2 seconds, relay will be de-energized. When ignition key is turned to Off position fuel pump relay will be de-energized. The fuel pump relay will also be de-energized within approximately two seconds, if crankshaft pulses are not received. This is a safety feature, in case of an accident fuel to engine compartment is shut-off.