Fuel Delivery and Air Induction: Description and Operation

The fuel system supplies the injectors with fuel necessary for combustion. This system is composed of the fuel pump, fuel pipes, fuel filter, pressure regulator, fuel delivery pipe and injectors.

The fuel pump supplies fuel under a pressurized condition to the fuel delivery pipe through the fuel filter. The pressure regulator mounted at the delivery pipe keeps the fuel pressure higher than the intake manifold pressure. Such difference between the intake manifold inner pressure and the fuel line inner pressure prevents any variation in the fuel injection rate of each injector.

The fuel system features an electric pump, a pressure regulator and injectors. The pressure regulator keeps fuel pressure higher than intake manifold pressure. This difference ensures fuel is supplied to the injectors at a constant rate. Intake air flows through an air cleaner, then the surge tank and intake manifold. The fuel delivery and injection processes are directed by the vehicle's on-board computer (Electronic Control Unit).

The intake system supplies the necessary air for combustion in each cylinder. Air passing through the air cleaner is forced into the surge tank, depending upon the opening degree of the throttle valve. Then, air passes through the intake manifold into each cylinder.