Fuel Pump Relay

Fuel pump relay receives current from the ignition switch when the switch is in the ON or START position. Basic power (12-14 volts) for the fuel pump and fuel pump control unit is supplied by the fuel pump relay when relay is energized by the ECU. Relay will be energized for approximately 5 seconds when ignition is first turned on. If RPM (One degree signals from crank angle sensor) are not received by the ECU, relay is de-energized. ECU will de-energize relay within 1.5 seconds after RPM signal has ceased.