hard start / poor MPG - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-07-2008, 11:02 AM   #11
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So
I did some more work and here is what I found. Fuel presure is 34. should be 37 to 41. When I turn off the car the presure drops quick to zero. Seems like I need a fuel pump and a presure regulator.
I put a vacuum on the regulator of 12# per the haynes instructions and the presure will rise by one #.
It is unclear if I need the regulator.
JOHN
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Old 01-07-2008, 06:54 PM   #12
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On the regulator, when you remove vacuum the pressure should go up to the high point of the rating or a little higher..

With the pressure drop it could be either the pump or the regulator..

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Old 01-08-2008, 10:27 AM   #13
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So how do I diagnose if it is the regulator. I do not want to replace good parts.
JOHN
PS thanks for the responses so far
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