Fuel Charging and Controls

FUEL CHARGING AND CONTROLS

The fuel charging and controls system consists of the:
- throttle body
- fuel injectors
- fuel charging wiring
- fuel injection supply manifold
- fuel pressure relief valve
- fuel pulse damper

The fuel charging and controls system is:
- a sequential multiport fuel injection (SFI) system.
- pulse-width modulated.
- mass air flow controlled.

The powertrain control module (PCM) controls the fuel injection system. Injector pulse-width is varied to control the amount of fuel flow through the injectors and into the engine. Mechanical returnless fuel system (MRFS) operates at a constant 65 psi.

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.
- should not be cleaned.

The fuel injectors:
- are electrically operated by the PCM.
- have an internal solenoid which opens a needle valve to inject fuel into the lower intake manifold.
- atomize the fuel as it is delivered.
- are deposit-resistant.

The fuel injection supply manifold:
- delivers fuel to the individual fuel injectors.
- receives fuel from the fuel supply line.

The fuel pressure relief valve:
- is used to relieve pressure from the fuel system.
- is located on the fuel injection supply manifold.

The fuel pulse damper:
- reduces pressure pulsations in the fuel injection supply manifold during fuel injector operation.