Question about 2003 GMC Sierra 1500
2003 GMC heavy half with 6L. Engine has a long crank time so I thought it was maybe the check valve on fuel pump. Let it sit for about an hour, pushed in the shreadder on fuel rail and no fuel came out. So that leads me to believe it IS the check valve on pump, Can you clean that valve at all like running sea foam through system or injector cleaner? Don't want to buy a new pump!!
Yes - Seafoam used properly can alleviate the problem. Seafoam used wrongly can do more harm than good so follow the instructions.
While you at it - take down the vin number and call the dealer nearest you and ask about RECALLS - this can save you a lot of headache. Matter of fact call two dealers - just to be sure.
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Posted on May 13, 2010
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Posted on Jan 02, 2017
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