The following are the main components of the fuel system:
| • | The Throttle Body Fuel Injection (TBI) unit |
| • | 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.
