Lumina V6-3100 3.1L VIN M SFI (1995)
Fuel Rail: Description and Operation
Fuel Rail Assembly
GENERAL DESCRIPTION
The fuel rail assembly is made up of the left hand rail, which delivers fuel to the even cylinders (2, 4, 6); the right hand rail, which delivers fuel to
the odd cylinders (1, 3, 5); the fuel injectors; and the fuel pressure regulator assembly. The rail assembly is mounted to the lower section of the
intake manifold and distributes fuel to the cylinders through the individual injectors.
Fuel is delivered from the pump through the fuel feed pipe to the inlet fitting on the fuel rail. From there it is directed, via the crossover tube, to the
other fuel rail. Fuel in each rail flows through the main supply conduit supplying fuel at the same pressure to each of the injectors. Fuel in excess
of injector needs flows back through the pressure regulator assembly which maintains correct system pressure. Fuel then flows from the regulator
through the fuel return pipe back to the tank.
