1999 GMC Yukon 5.7 2WD intermittently will not start. After a few hours of sitting it starts again like nothing was wrong. It may perform fine for days, weeks, and months and then fail again only to work again after sitting for hours with no worked performed. The engine turns over just fine but is not getting fuel. In the beginning I changed the fuel pump (three times). But as I changed the fuel pump each time it checked out fine. I have checked all the fuses and they are good. I have changed and checked the fuel pump relay and it is good. Using a wiring diagram I have seen the next component to check that controls the fuel pump is the Vehicle Control Module (VCM). The way I read the wiring diagram I should be able to apply 12V to the 87A socket on the relay board and start the fuel pump prime, is that correct? Am I on the right track? I see literally thousands of post about this issue with 90 model GMCs but have not seen a satisfactory solution.
have the same problem?
Monday, June 11th, 2012 AT 2:04 AM