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#9: 02-08-2013, 04:49 PM
Title: Senior Contributor
Location: Atlanta suburbs
Car: 2010 LGT
Posts: 839
iTrader: (7)
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I've had it happen only when cold on some cars and only when hot on others. Basically it's a defect in the pump where instead of sealing fuel in the line under pressure it just bleeds it back into the tank. I had a car a few months ago that would only do it every fourth or fifth start. Hooked a fuel pressure gauge inline and under idle was seeing approx 35-45 psi. Would let it sit for hours holding around 25 psi. Then I would try a few more times and it would get to below 10 psi and extended crank condition would happen until the pump pushed pressure over 20 psi.