Fuel Delivery and Air Induction: Description and Operation

PURPOSE
The Fuel Delivery and Air Induction Systems delivers filtered air and a precise amount of highly atomized fuel to the intake system to ensure optimum performance and emissions compliance.

OPERATION
The Fuel Delivery and Air Induction Systems perform this function in the following manner:

Fuel Delivery and Return
Fuel pumped up by the Fuel Pump, flows through the Fuel Filter and is distributed to each Injector at a set pressure maintained by the fuel pressure regulator.
The fuel pressure regulator adjusts the pressure of the fuel from the fuel line (high pressure side) to a pressure 284 kPa (41 psi) higher than the pressure inside the cylinder head, and excess fuel is returned to the fuel tank through the return pipe.
A pulsation damper absorbs the slight fluctuations in fuel pressure caused by the opening and closing of the injectors.
The injectors are operated by the Engine Control Module (ECM) and inject fuel into the cylinder head, right behind the intake valves.

Air Induction
Air is filtered through the Air Cleaner and the amount of air flowing to the air intake chamber is controlled by the throttle valve opening in the throttle body and the engine speed. Intake air controlled by the throttle valve opening is distributed from the air intake chamber to the manifold of each cylinder and is drawn into the combustion chamber.
The ECM controls engine idle speed by controlling the Idle Air Control (IAC) valve opening, which allows air to bypass the throttle plate into the air intake chamber.
The air intake chamber prevents pulsation of the intake air. It also prevents intake air interference in each cylinder.