System Description

When you turn ON the ignition switch, control module enables fuel pump, relay which powers fuel pump ON. Fuel pump remains ON as long as engine is cranking or running and control module receives ignition reference pulses. If there are no ignition reference pulses, control module shuts fuel pump OFF within 2 seconds after ignition was switched to ON position or if engine stops. Fuel tank stores fuel supply. Electric fuel pump supplies fuel through an in-line fuel filter to fuel injection system. Pump provides fuel at a higher rate of flow than is needed by fuel injection system. Fuel pressure regulator maintains correct fuel pressure to fuel injection system. A separate pipe returns unused fuel to fuel tank.