Question about 2003 Chevrolet Impala
Not sure why Haynes says to do that. below is instructions from autozone.com, and none of the engines require the fuel rail to come off. That said, if you have the 3.4, you may need to pull the upper intake manifold. Fig. Exploded view of the fuel pressure regulator mounting-3.4L (VIN E) engines
Removal & Installation The need to work as cleanly as possible cannot be over-emphasized. Even the smallest amount of dirt, if allowed into the fuel pressure regulator and/or the fuel rail, will find its way to the fuel injectors. The nozzle openings of the injectors are very small. Keep hands and tools clean. Clean the areas to be disconnected with a suitable solvent. Carefully cover open fittings and connections to keep out foreign material. Dirt in the injectors almost guarantees a clogged fuel injector and engine performance problems.
3.4L (VIN E) Engines
Fig. Exploded view of the fuel pressure regulator mounting-3.4L (VIN E) engines
Posted on Mar 16, 2011
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Posted on Jan 02, 2017
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