CTS V6-3.2L VIN N (2003)
Fuel Rail: Description and Operation
The fuel rail consists of 4 parts:
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The pipe that carries fuel to each injector
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The fuel pressure regulator
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The fuel pressure test port
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Six individual fuel injectors
The fuel rail is mounted on the intake manifold and distributes the fuel to each cylinder through the individual injectors.
The fuel is delivered from the pump through the fuel feed line to the inlet port of the fuel rail pipe. From the fuel feed inlet, fuel is directed to the rail
pipe to the fuel pressure regulator. Any fuel in excess of the injector needs will flow back through the pressure regulator assembly to the outlet port of the
fuel rail. The fuel then flows through the fuel return line to the fuel tank to begin the cycle again.
