My 2002 Chevy express 3500 runs good for about 5 hours. Then as is gets hotter outside the vehicle will lose power and not go over 20 mph ..let it sit for 20 min start backup and it runs fine for another few hours then have to do it again any idea what this could be.
Might be the fuel pump or fuel filter.
SOURCE: hard to start chevy 350 vortec
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
SOURCE: 1988 honda accord runs for 10-20 min, then loses engine power
Have you checked your alternator?
SOURCE: 1992 jeep wrangler (4.0l , standard)- power loss after warm up.
Check your transmission fluid level and check for transmission fluid leaks. maybe
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