fuel rail not holding pressure

Hello, On my 1998 Aurora (114,000 miles) with new plugs, wires, fuel filter and FPR I noticed it seems to have more long hard start problems than it did before I changed everything. It seems like the relief valve to drain the pressure of does not hold a hole lot of pressure. Where else could it be losing the fuel pressure? There are no leaks anywhere that I can see. Thanks

Did you fit the FPR 'O' rings properly?

It was an Ac Deco and everything was already on it. I just put it in and snapped the o-ring on it. Would it leak if it was on wrong or just act up? Thanks

maybe an injector is leaking down when the car is shut off??

I hooked up a pressure guage to it and it was dropping down to 0 as soon as the car was off. I took the FPR back out and found that the small O-ring on the bottom was just a little bigger than the one I took out and it cocked it in the groove. I put the old O-ring off of the other FPR and now I am holding 42 PSI for over 15 minutes, no leakdown and about 42-43 at idle. I will see now if it stops my hard start problems. Thanks

When I hook up the Fuel pressure guage now and fill the system with car off it rises about 4-5 psi after the fuel pump quits running then after about 15 minutes it loses 5-6 psi. Is there something wrong or is it normal to lose pressure after sitting? Thanks