Fuel Supply System

An electric fuel pump (located inside fuel tank as an integral part of fuel gauge sending unit) supplies fuel under pressure to throttle body. A fuel pump relay located on the left or right side of the engine compartment controls fuel pump operation. When the ignition is turned on, the fuel pump relay activates the fuel pump for 1 1/2-2 seconds to prime the injector. If the ECM does not receive reference pulses from the distributor after this period, the ECM deactivates the fuel pump circuit. The fuel pump relay will be activated again when the ECM receives distributor reference pulses.