2000 Chevrolet Silverado Cranks No Start

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DHJH
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2000 chevy 1500 z71, 5.3l. 48000 miles. every couple months engine will not start. It will crank but won't start. let it sit for 20 minutes then will start. It will work fine for a few months and then do it again.
2 GM mechanics haven't a clue. I did replace the fuel regulator because it was bad and was told that it might have been the problem, but it has happened again. I have plenty of fuel line pressure. could I have a faulty fuel pump? :cry: :arrow:
Dec 10, 2006 at 5:35 AM
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BACKYARDMECHANIC
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It could be the fuel pump but the only way to tell for sure is to test it and do a visual check of the entire fuel line. Start by thinking about changing the fuel filter. (when was the last time it was changed?) Second check the line for any leaks or kinks, even small ones can make a difference. You say you have plenty of line pressure but how do you know this? You will need a fuel pressure tester in order to make a few checks. After connecting the tester check that the pressure is with in specs for the car with it running. Then check that the presure is in specs after the car is turned off to make sure the pressure doesn't drop too much. Hope this helps Backyardmechanic
Dec 10, 2006 at 8:59 AM
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Suggested Repair

Test the fuel pump rather than replacing it on guesswork. Change the fuel filter if its service history is unknown, inspect the fuel lines for leaks or kinks, and use a fuel-pressure gauge to confirm pressure is within specification while running and does not drop excessively after shutdown.

Conversation Summary

A 2000 Chevrolet Silverado 1500 Z71 with a 5.3L engine intermittently cranks but will not start, then starts after sitting about 20 minutes and runs normally for months. The fuel-pressure regulator was replaced and line pressure appears adequate, but the problem returned. The expert says a faulty fuel pump is possible but must be verified by inspecting the fuel lines, considering a fuel-filter change, and measuring both running and residual fuel pressure.

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