Fuel Delivery and Air Induction: Description and Operation

General System Description:

The fuel delivery system consists of the fuel tank, fuel pump, fuel filter, fuel pressure regulator, fuel rail, six injectors and associated lines, and hoses. Fuel is pumped from the fuel tank into the fuel rail through the fuel injectors and the fuel pressure regulator, and returns to the tank via a return line. The Engine Control Unit (ECU) controls the
amount of fuel injected according to a programmed response to ECU inputs from sensors.
The 3.0L Multi-Point Fuel Injection System consists of six injectors which fire once per engine revolution simultaneously. Due to the fact that it requires two engine revolutions to complete one engine cycle the injectors fire twice per engine cycle. This system is called "simultaneous double fire injection".
The ECU controls the amount of fuel injected by controlling the length of time the injectors are open, this period of time is known as injector "pulse width".