FI Main Relay

The FI main relay is located in fuse/relay block on left side of engine compartment, near the battery. The FI main relay supplies voltage to fuel pump relay when ignition is turned on. The ECM grounds fuel pump relay, and power is then supplied to the fuel pump.

Fuel pump will operate as long as engine is cranking or running and ECM is receiving ignition reference pulses. If no ignition references are received, ECM will shut off the fuel pump.