Questions on pulling fuel rail

[Mossyoakglock]

I am still getting a stumble at start-up randomly and I'm still trying to diagnose it. I replaced the fuel pump and it helped but it does it maybe once every week or two where before it was a few times a week.

I checked the fuel pressure and it idled at 45-46 PSI solid and had no pressure drop in 1 minute. Before the new pump the fuel pressure would bounce between 40 and 48 psi, now it's solid at 46 psi. But, I left the fuel pressure gauge on the truck overnight from 8pm until roughly 8am the next morning and it had dropped to around 24 PSI. My next test is to pull the injectors out while still attached to the fuel rail and see if anything leaks overnight on to some shop towels and then prime the system to check for leaks. I have 3 questions:

1. Is there enough slack in the fuel line coming into the fuel rail to be able to pull the fuel rail & injectors and not break the line? I know I'll have to disconnect the injector plugs/harness to get the clearance to lift the fuel rail up. Probably only need about an inch or so.
2. Does anybody have a fuel system diagram for the GMT-900 trucks, specifically a Crew Cab?
3. Where do the 3 lines on the fuel pump go?

I don't get a hard start or any codes either. I figured it's cheap enough to get a set of injector o-rings and physically inspect the injectors vs a leak test (which came back ok). I'm wondering if there are any other pressure regulators or sensor along the fuel lines. Had it at the dealer for this but they said all fuel pressure related systems were functioning properly. I did get a recall for the airbag issue so if I can't figure this out by the time they get the parts in for the recall, I'll have them look into it again.