Question about 1999 GMC Sierra

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Truck runs for a couple of seconds then dies

Truck has no codes, fuel pressure is 60 psi when you turn key to on position, then kicks down to 56psi when pump kicks out,I pulled out the crank sensor then there is no firing at all. this truck did this before then ran for about three more days. I think the fuel pressure is ok but not sure. this truck has 90000 miles. this is a 1999 gmc suburban 5.7

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  • 308 Answers

Replace the fuel pressure its malfunctioning .

Posted on Jun 22, 2009

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Minimum fuel pressure should be 56psi. 54 or 55 will cause it not to start. It needs the pressure to open the mechanical poppets at the end of each injector. To low of pressure and the poppets will not open.

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