Question about 2000 Chevrolet Blazer

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2000 Blazer Will not stay running

I have a 2000 Blazer 4WD with 180,000 miles and an automatic transmission. Cruising down the highway at 60 mph, ambient temp is 95 (roughly) degrees, the truck acts like it is running out of gas. Kick it up into neutral and give it gas and it and shuts down. This is after about 30 minutes. Fuel tank is half or better. Fuel pump does not run when key is turned on, but runs when key is turned off, engine cranks, but will not start. Let it sit for 20 minutes or so, fuel pump runs when key is turned on and when key is turned off. Engine will start, but it sputters and usually dies. After about 45 minutes to an hour or longer, fuel pump runs when key is turned on and then off, engine cranks and runs like a top, then dies again. No check engine light or codes in the ecm. I am a mechanic, but do not have a whole lot of expertise with this fuel system and i don't want to needlessly change parts. I thought it might be the fuel pump so
today I dropped the fuel tank and installed some fuel line from the outlet to the return on the fuel pump. Let the pump run for almost an hour with no defects or issues. Put everything back together and cranked it up. Ran like a kitten for about ten minutes, then the same thing. Fuel pump relay in the fuse box was almost too hot to touch. Swapped it for the rear window relay and after a while, it started up, but after 10 minutes, the same issues arise. No check engine light, no codes, no truck. No fuses are blown. I have checked the ignition system and there are no issues with that. Any thoughts?

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Wow, you seemed to have changed what I would have recommended to someone in your shoes.

If the fuel pump relay is hot, I think that there could be a crossed wire somewhere.

I would take it to an auto electric shop to diagnose problem if it's worth putting more money into it.

Posted on Jul 05, 2010


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If this was towed professionally they should have known better... You might have a case due to professional negligence.

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