Fuel Charging and Controls

The fuel charging and control system consists of the:

• electronic throttle body (TB).
• fuel injectors.
• fuel rail.
• fuel rail pressure and temperature sensor.

The fuel rail:

• delivers fuel to the individual fuel injectors.
• receives fuel from the fuel supply tube. The electronic TB:
• controls air supply to the intake manifold by electronically positioning the throttle plate.
• is not adjustable.
• cannot be cleaned.

The fuel injectors:

• are electrically operated by the powertrain control module (PCM).
• atomize the fuel as the fuel is delivered.
• are deposit-resistant.
• each have an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.

The fuel pump driver module (FPDM):

• engages the fuel pump when energized by the PCM.
• The fuel rail pressure and temperature sensor:
• measures the fuel temperature.
• maintains constant fuel pressure throughout the fuel system and to the fuel injectors.
• is spring-loaded and operated by intake manifold vacuum.