Fuel Delivery and Air Induction: Description and Operation

Fuel Flow
Fuel is drawn from the fuel tank into the fuel pump. As fuel flows through the mechanical fuel damper, pulsation in the fuel flow is dampened.
The fuel is then filtered in the fuel filter, flows through the fuel line, and is injected into the intake manifold cylinder branch from the injector.
Excess fuel is fed through the pressure regulator and is returned to the fuel tank. The pressure regulator controls the fuel pressure so the pressure difference between the fuel pressure and the intake manifold vacuum is a constant 36.3 psi. During starting when the coolant temperature is below specifications, the cold start valve is actuated by the thermotime switch to increase the quantity of fuel.

Injection System
The fuel injection system provides simultaneous injection of fuel into the intake manifold for all cylinders. The injectors are connected electrically, in parallel, within the control unit. All injectors are triggered once each crankshaft revolution by the ignition coil. Each injection provides one half the fuel required for the engine to complete one cycle. (Intake, Compression, Combustion, Exhaust). The air/fuel mixture is drawn into the cylinder when the intake valve opens to begin the intake stroke.