Fuel Induction System

Fuel System Components:

Component Locations:

PURPOSE

The Electronic Fuel Injection system is a multiport, pulse fuel injection system. This system supplies the engine with air/fuel mixture necessary for efficient combustion.


OPERATION
When the ignition is "ON", the Powertrain Control Module (PCM) relay is energized. The PCM relay provides battery power to the PCM, the fuel pump relay and fuel injectors. Power to the fuel pump is supplied from the fuel pump relay. During engine cranking, the fuel pump circuit is grounded by the PCM, closing the contacts in the fuel pump relay. Power then flows from the fuel pump relay through The Inertia Fuel Shutoff Switch (IFS) and energizes the fuel pump. Once the engine is running, a switch in the Vane Airflow Meter (VAF) is closed, keeping the fuel pump relay energized, for constant fuel pump operation.

NOTE: The IFS is a safety device used to shut off the fuel pump in the event of a collision. If the IFS switch is "TRIPPED", it must be reset by depressing the button on top of the switch.

The fuel pump, mounted in the fuel tank, then supplies pressurized fuel through the fuel supply line and filter (the fuel filter is mounted in line on the fuel supply line), to each fuel injector, by way of the fuel injection supply manifold. The fuel pressure is regulated by the fuel pressure regulator located in line on the return line side of the fuel injection supply manifold. Excess fuel pressure is bled back to the tank through the fuel return line.

The injectors then inject the fuel into the intake runners above the intake valves. The PCM controls the opening duration (pulse width) of the fuel injectors in order to maintain optimum exhaust emission control and engine performance for all operating conditions.

SUB-SYSTEMS

^ High-pressure fuel filter.

^ High-pressure electric fuel pump (located in fuel tank).

^ Fuel injection supply manifold with fuel pressure regulator.

^ Fuel injectors.

^ Fuel pump relay.

^ Fuel tank.

^ Inertia fuel shutoff switch.