Fuel System General Description

Fuel Supply Component Description
The fuel supply is stored in the fuel tank. An electric fuel pump pressurizes the fuel through an in-line fuel filter through the fuel lines to the fuel rail. The electric fuel pump is suspended from the top of the fuel tank The fuel pump is designed to provide fuel at a pressure above the regulated pressure needed by the fuel injectors. A pressure regulator keeps the fuel available to the fuel injectors at the regulated pressure. The unused fuel is returned to the fuel tank by a separate hose and pipe.

The 1.6L (VIN 6) engine is designed to use only unleaded fuel. Unleaded fuel must be used for proper emission control system operation. Using unleaded fuel will also decrease spark plug fouling and extend engine oil life. Leaded fuel can damage the emission control system, and its use can result in the loss of emission warranty coverage.

This vehicle is also equipped with an evaporative emission ([1][2]EVAP) system that minimizes the release of fuel vapors to the atmosphere.

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 (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.

Accelerator Controls
The accelerator control system is cable-operated. When the accelerator pedal is depressed the cable pulls the throttle lever open (increasing the throttle plate opening), and when the accelerator pedal is released, the throttle lever spring pressure returns the throttle lever to the idle position (decreasing the throttle plate opening).