Fuel Charging and Controls

FUEL CHARGING AND CONTROLS

Component Location, Part 1:

Component Location, Part 2:

The fuel injection supply manifold (gasoline):
- delivers fuel to the fuel injector.
- receives fuel from the fuel supply line.

The fuel shut-off solenoid (natural gas):
- is normally closed.
- opens when the key is in the RUN or START position.
- shuts off the fuel supply if the vehicle is shut off or if the inertia fuel shut-off is triggered.

The throttle body:
- controls air supply to the upper intake manifold by positioning the throttle plate.
- connects the accelerator cable and, if equipped the speed control actuator cable to the throttle plate.
- is not adjustable.
- cannot be cleaned.

The fuel injector:
- uses the replacement O-ring if needed.
- is electrically operated by the powertrain control module (PCM).
- has an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
- atomizes the fuel as the fuel is delivered.
- is deposit resistant.

The fuel pressure relief valve:
- is used to inspect and relieve fuel pressure.

The fuel pressure regulator:

CAUTION: Use O-rings that are made of special fuel-resistant material. Use of ordinary O-rings can cause the fuel system to leak. Do not reuse O-rings.

- maintains a constant fuel pressure throughout the fuel system and to the fuel injector.
- is spring-loaded and operated by the intake manifold vacuum.

The fuel injection supply manifold (natural gas):
- delivers fuel to the fuel injector.
- receives fuel from the fuel supply line.
- provides mounting surfaces for the fuel temperature sensor and the fuel pressure sensor.
- provides mounting surface for the main fuel shut-off solenoid.