Fuel Delivery System

The fuel delivery system consists of the fuel tank, fuel pump, fuel filter, fuel pressure regulator, delivery pipe, fuel pulsation damper and fuel injectors.
The fuel in the fuel tank is pressurized by the fuel pump, filtered by the fuel filter and fed under pressure to each injector through the delivery pipe.
As the fuel pressure applied to the injector (the fuel pressure in the fuel feed line) is always kept a certain amount higher than the pressure in the intake manifold by the fuel pressure regulator, the fuel is injected into the intake port of the cylinder head when the injector opens according to the injection signal from ECM.
The fuel relieved by the fuel pressure regulator returns through the fuel return line to the fuel tank.
For the structure and operation of the fuel tank and filter, refer to Description and Operation of that component.