Fuel Delivery System

The fuel in the fuel tank is pumped by the fuel pump, filtered by the fuel filter and fed under pressure to each injector through the fuel rail. The fuel pressure applied to the fuel injector, or the fuel pressure in the fuel feed pipe, is always kept 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 pulse signal from the Powertrain Control Module (PCM). The fuel relieved by the fuel pressure regulator returns through the fuel return pipe to the fuel tank.