On most of the newer fuel injected cars it should have around 45-55psi with the key on and engine off. It sounds like a pressure regulator. pull the vacuum line off of the regulator and check for gas, If there is gas in the line then the regulator is leaking. You can also hook up a vacuum pump to the regulator port, If it holds vacuum the diaphragm inside is good. If not replace the regulator.
Edit: Not sure about the newer F-Bodies but on the H platform cars we had problems with a piece in the tank leaking. I think it was a dampener rite after the pump. It's supposed to smooth out the fuel flow after it comes out of the pump. We had a few of them cause a leak down and hard start problem also. But I would lean more towards the regulator.
Last edited by Stevoone; 11-11-2008 at 07:26 AM.
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