Question about 1999 GMC Sierra
Pretty sure these trucks use the oil pressure switch as a backup in case the fuel pump relay has issues. Swap the fuel pump relay with one of the others under the hood like the horn or ABS . It should say which one under the cover. If this doesnt help you may have a pump pressure issue that needs a gauge to test
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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