Fuel System

OPERATION
The vehicle is equipped with multiport fuel injection system. Separately controlled fuel injectors are mounted in the intake manifold for each cylinder. The fuel injectors are supplied under high pressure through the fuel injection supply manifold which also is equipped with a fuel pressure regulator. The fuel pressure regulator controls the pressure going into the fuel injectors and also returns excess fuel to the fuel tank.





COMPONENTS





The fuel injection supply manifold:
- Delivers fuel to the individual fuel injectors.
- Receives fuel from the fuel supply line.
- Returns unused fuel to the fuel tank through the fuel return line.





The throttle body:
- Controls air supply to the upper intake manifold by positioning the throttle plate.
- Connects the accelerator cable and if equipped speed control actuator cable to the throttle plate.
- Is not adjustable.
- Cannot be cleaned.





The fuel injectors:
- Are electrically operated by the powertrain control module (PCM).
- Each have an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
- Atomize the fuel as the fuel is delivered.
- Are deposit-resistant.





The fuel pressure relief valve:
- Is used to inspect and Perform Fuel Pressure Release.





The fuel pressure regulator:
- Maintains a constant fuel pressure throughout the fuel system and to the fuel injectors.
- Is spring-loaded and operated by intake manifold vacuum.





The (A) A/C compressor clutch control relay (if A/C equipped):
- Is controlled by the powertrain control module.
- Interrupts A/C clutch operation during engine start or manual transmission clutch engagement to reduce engine load.





The (A) fuel pump relay:
- Engages the fuel pump when energized by the powertrain control module.