Fuel Delivery

The fuel charging and controls system consists of the:
- throttle body.
- fuel injectors.
- fuel charging wiring.
- fuel injection supply manifold.
- fuel pressure regulator.
- fuel pressure relief valve.
- A/C compressor clutch relay.
- fuel pump relay.

The fuel charging and controls system is:
- a multiport, Sequential Fuel Injection (SFI) system.
- pulse-width modulated.
- mass air flow controlled.







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, the speed control actuator cable to the throttle plate.







CAUTION: Use fuel system O-rings which are made of special fuel resistant material. Use manufacturer's replacement O-rings, if needed.

The fuel injectors:
- are electrically operated by the Powertrain Control Module (PCM).
- atomize the fuel as the fuel is delivered.
- are deposit-resistant.
- each has an internal solenoid which opens to inject fuel into the lower intake manifold.







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







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

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 fuel pump relay engages the fuel pump when energized by the powertrain control module.