The fuel rail is mounted on the intake manifold and distributes fuel
to each cylinder through the individual injectors.
Fuel is delivered from the pump through the fuel feed pipe to the inlet
port of the fuel rail pipe. From the fuel feed inlet, fuel is directed to
the front rail pipe, then a crossover to the rear pipe, then through the
rear rail pipe to the fuel pressure regulator. Fuel in excess of injector
needs flows back through the pressure regulator assembly to the outlet
port of the fuel rail. Fuel then flows through the fuel return pipe to
the fuel tank to begin the cycle again.
A eight digit identification number is stamped on the fuel rail assembly.
The model identification contains the Julian date, the year, and the shift.
Refer to this model identification number if servicing or part replacement
is required.
The Multec 2 single spray fuel injector utilizes a stamped spray-tip.
The fuel injector is a solenoid device controlled by the PCM that meters
pressurized fuel to a single cylinder. When the PCM energizes the injector
coil, a normally closed ball valve opens, allowing fuel to flow past
a director plate to the injector outlet. The director plate has holes
that control the fuel flow, generating a dual conical spray pattern
of finely atomized fuel at the injector outlet. Fuel from the outlet
is directed at both intake valves, causing it to become further vaporized
before entering the combustion chamber.
Fuel injectors will cause various driveability conditions if they will
not open, are stuck open, leaking or have a low coil resistance.