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Testing fuel pressure and pressure check valve.
So last time I posted on here I ended up having a $3700 rag stuck in my intake passage for cylinder no.1 oops. Got the head studs and peskie oil leak fixed. And looking through my paper work I see that the injectors were replaced about 60k ago with alliant power factory Injectors. Problem is the other day driving home I dropped #2. completely dead with #2 contribution code. No smoke just shook like a b on lock up. Was getting ready to pull injector and decided to check fuel pressure for the hell of it. KOEO pump runs right to 60 psi. Immediately after pump stops it drops to 0 within 5 seconds. That to me being a fleet mechanic with gas engines and fuel injection seems to be an issue. I know that there should be a check valve but where is it? And how long should they hold pressure? Is that normal? I have noticed when it starts in the morning that it kinda... "Barks" when it starts to fire up. Now my first baby is on the way and mamma don't want me spending all my time and money on it so any help is appreciated.
P.s. I checked the whole injector harness ficm voltages and did cylinder contribution test which confirmed #2 and with valve cover off I can hear and feel the injector working electronically.