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 fuel pressure accumulator on front TBI unit. From the accumulator, fuel enters the pressure regulator on rear TBI unit. A fuel pump relay (located on left side of engine compartment) controls fuel pump operation.
When ignition switch is turned on, fuel pump relay activates fuel pump for 1 1/2-2 seconds to prime the injectors. If ECM does not receive reference pulses from the distributor after this period, it deactivates fuel pump circuit. The fuel pump circuit will be activated again through the relay when ECM receives distributor reference pulses.
NOTE:
Power to relay from battery is provided when oil pressure is above 4 psi (.3 kg/cm2
). If pump relay malfunctions, engine could still be started after oil pressure has reached 4 psi (.3 kg/cm2
).