Fuel Delivery System

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.







NOTE: If O-rings need to be replaced, use the replacement parts.

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 that opens a needle valve to inject fuel into the lower intake manifold.







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







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.







Fuel Charging Wiring Connections