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 the fuel pressure compensator on the front TBI unit. From the fuel pressure compensator on the front unit, fuel enters the pressure regulator of the rear TBI unit. A fuel pump relay located on left side of engine compartment (behind driver's seat on Corvette) controls fuel pump operation. When the ignition switch is turned on, the fuel pump relay activates the fuel pump for 1 1/2-2 seconds to prime the injectors. If the ECM does not receive reference pulses from the distributor after this period, the ECM deactivates the fuel pump circuit. The fuel pump circuit will be activated again through the relay when the ECM receives distributor reference pulses.

NOTE: Power to relay from battery is provided when oil pressure is above 4 psi. If pump relay malfunctions, engine could still be started after oil pressure has reached 4 psi.