Fuel Charging And Controls
WARNING:
- Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related components. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in personal injury.
CAUTION:
- Use O-ring seals made of fuel-resistant material. Use of incorrect O-ring seals may result in fuel leakage.
The fuel charging and controls system consists of the:
- fuel injectors
- fuel charging wiring
- fuel injection supply manifold
- fuel pressure relief valve (3.0L only)
- 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. Varying fuel pump output controls fuel pressure. The PCM commands the fuel pump driver module, which directly controls the fuel pump.
The fuel injection supply manifold:
- delivers fuel to the individual fuel injectors.
- receives fuel from the fuel supply line.
The fuel injectors:
- are electrically operated by the powertrain control module.
- 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 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.