DeVille V8-4.6L VIN 9 (1995)
Fuel Rail: Description and Operation
Fuel Rail
FUEL RAIL
The fuel rail consists of five 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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The fuel rail ground strap
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Eight individual fuel injectors
FUEL DELIVERY
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.
