K 2500 Truck 4WD V8-454 7.4L VIN J SFI (1997)
Fuel Rail: Description and Operation
Fuel Rail Assembly
Description
The fuel rail assembly is made up of a single in-line composite rail which delivers fuel to the fuel injectors. Unused fuel returns to the fuel tank via the
fuel pressure regulator assembly. The fuel rail is mounted to the lower section of the intake manifold and distributes fuel to the cylinders through the
individual fuel injectors.
Operation
Fuel is delivered from the fuel pump through the fuel feed line to the inlet filling on the limited recirculation deadheaded fuel rail. From there it is
directed to the main plastic supply conduit via an inlet tube. Fuel flows through the main conduit supplying fuel at the same pressure to each of the fuel
injectors. Fuel in excess of injector needs, flows immediately back through the pressure regulator assembly via a bypass tube immediately located just
pass the inlet fitting on the fuel rail The pressure regulator assembly maintains correct system pressure. Fuel then flows from the pressure regulator
through the fuel return line back to the fuel tank.
