I have a 1998 gmc Sierra 5.7 vortec with 84,000 miles. Whenever the outside temp gets around 90 degrees and I drive my truck for awhile, it won't start for about 20 min. after I turn it off, I must allow it to cool. Had a new fuel pump installed twice, changed the fuel pump relay and still having the same problem. Can someone please help me. Thanks in advance. Rob
1998 GMC Sierra
Jul 17, 2008
2 Replies
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I had the same problem on my 2000 and that did it. I don't know why heat affects it but it did on mine.
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