Question about 2000 Chevrolet Silverado 1500

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Fuel pressure problem

Fuel pressure bounces around between 20 and 50 psi on my 2000 1500 silverado when hooked up to a fuel pressure guage. what is the problem? Had problem with it running so i changed the fuel filter, now it runs somewhat better but then i hooked the fuel pressure guage up and got those readings. fuel pump bad?

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Theres 2 options,voltage feeding pump is fluctuating,or pump itself is going bad!

Posted on Apr 18, 2009

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How to chck a fuel pump


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2000 gmc jimmy wont start fuel pump comes on and cuts off but will not start.I have changed the fuel filter and that did not work. Is the pump not building the pressure it needs to start or would my...


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You will need to do a fuel pump pressure leak-down test, the pump must not loose more than 5 PSI overnight, u will need a cheap fuel pressure test guage, the test port is on the fuel supply rail to the injectors on the intake manifold, it looks like a tire valve but metal with a plastic cap on it, u may be able to borrow this guage from Kragen, Autozone or a parts store like them, if not they are very cheap, less than $20 US. Run the engine with the test guage hooked up, turn off the engine and then check it in an hour or so, if it drops more than 5 PSI then u will need to replace the fuel pump in the gas tank. One note make sure the connection for the guage is tight with no leakage or the test is invalid

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