For 1990-2009 cars

The following are the main components of the fuel system:

• | The Throttle Body Fuel Injection (TBI) unit

• | The fuel pump

• | The fuel tank

• | The fuel filter

• | The fuel feed pipes and hoses

• | The fuel return pipes and hoses

The fuel supply is stored in the fuel tank. An electric fuel pump pressurizes the fuel through an in-line fuel filter to the throttle body injection unit. The electric fuel pump is located in the fuel tank. The fuel pump is designed to provide fuel at pressures and volumes greater than that needed by the fuel injector. A fuel pressure regulator keeps the fuel supplied to the fuel injector at the regulated pressure. The regulated pressure is always kept higher than the pressure in the intake manifold. Unused fuel is returned to the fuel tank by a separate return pipe and hose.

The fuel injector opens according to the injection pulse signal from the Powertrain Control Module. The fuel is injected into the intake manifold in a cone shaped (conic) dispersion pattern. The injected fuel is mixed at the throttle body throat with the incoming air. This air/fuel mixture is drawn through a clearance between the throttle valve and throttle bore into the intake manifold. The intake manifold distributes the air/fuel mixture to the combustion chamber of each cylinder.

The 1.0L (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. The use of leaded fuel can result in the loss of emission warranty coverage.

This vehicle is equipped with an evaporative emission system that minimizes the release of fuel vapors to the atmosphere. For more information on this system review EVAP Control System description and operation.