01-06-2008, 05:38 PM
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Hummer Guru
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Join Date: Dec 2002
Location: Anywhere you're not!
Posts: 5,006
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Re: Was on, now off
Quote:
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Originally Posted by HUMTECH
Whats the fuel pressure at? If a little low means down about 57-61 psi before changing the pump you should check the regulator. With a fuel pressure gauge installed and engine running remove the vacuum source from the regulator(on the left fuel rail) and see what the fuel pressure does. If it jumps up to 67-69 psi the pump is making pressure but the regulator is lowering the pressure a little too much.
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It's at about 50. |