The following are the main components of the vehicle's
sequential fuel injection (SFI) system:
| • | The throttle body assembly |
| • | The fuel pressure regulator |
| • | The fuel feed pipes and hoses |
| • | The fuel return pipes and hoses |
The supply of fuel is stored in the fuel tank. An electric fuel pump
pressurizes the fuel through an in-line fuel filter to a fuel rail assembly
that supports the fuel injectors. 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 located on the fuel rail keeps the fuel supplied to the fuel
injectors 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 injectors opens according to injection pulse signals from the
powertrain control module. The fuel is injected into the intake ports in
a cone shaped (conic) dispersion pattern.
The 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's fuel system is equipped with an evaporative emission
control system that minimizes the release of fuel vapors to the atmosphere.
For more information on this system, refer to EVAP Control System Operation Description
.
