Fuel pressure test. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Trouble shooting + Test Procedures Need to trouble shoot whats wrong and need to know the best way to test for it? Here it is.

 
 
 
 
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Old 10-01-2009, 02:45 PM   #1
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Default Fuel pressure test.

Locate your schraeder valve. It will be on the fuel rail.


Hook up your fuel pressure tester, place a clean rag under the fuel rail to collect any gas that leaks out.


Now turn your ignition key to the run position, but do not start it. You should have between 45 and 50 psi


Now start the engine, your fuel pressure should be about the same.


Rev the engine and the fuel pressure should go up and then drop back down to about the same area and hold there.
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