Originally Posted by
ala_xfire
Personally, I think if the car runs OK after starting, the pump is fine.
I suspect the check valve in the filter to be the culprit, unless of course you have a leak somewhere between the filter and the fuel rail.
Sounds like a good idea except we've changed filter twice with no change and clamping fuel supply line system holds pressure. Also, clamped line feeding fuel rail at filter and pressure holds - so no fuel line issues. My guess is that the check valve leaks but the fuel pump can supply fuel to engine and make up for leakage. It does take about 7 seconds for the pressure to bleed off, so if it is the check valve it isn't stuck wide open but just leaking.