Question about 2000 Chevrolet Blazer
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?
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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Posted on Jan 02, 2017
Tips for a great answer:
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
Did you flush the grit out of the transmission cooler and the lines to it? If not you may have ruined a new transmission.
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