Fuel Pump Relay

The fuel pump relay is an electro-mechanical switch. The relay is located in engine compartment, on right inner fender panel. See Figure . Battery voltage is applied to the relay from the ignition switch and is energized when a ground is provided by the ECU. When the relay is energized, voltage is applied to the fuel pump through the fuel pump ballast resistor. During engine starting or cranking, fuel pump relay and ballast resistor are by-passed and voltage is supplied to the fuel pump through the starter relay. During wide open throttle conditions, the fuel pump relay and ballast resistor are again by-passed and voltage is then supplied by the oxygen (O2) sensor heater relay.