Fuel Pump: Description and Operation

Fuel Pump Control

When the ignition is turned ON (II), the ECM grounds PGM-FI main relay (FUEL PUMP) which feeds current to the fuel pump for 2 seconds to pressurize the fuel system. With the engine running, the ECM grounds PGM-FI main relay (FUEL PUMP) and feeds current to the fuel pump. When the engine is not running and the ignition is ON, the ECM cuts ground to PGM-FI main relay (FUEL PUMP) which cuts current to the fuel pump.