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Stk fuel pump pressure is 71-92 and the way I see it you say you have 95-97 which is just a little higher. So my GUESS is that the FPR might need replacement.
Although when you did that bit where the rail read 38-39psi and when you put 15hg vac on the FPR the pressure read close to 30 psi...............that show at least me that the FPR is working right in that respect. Mostly I say that because a stk car idling will read 28-32 psi at idle and that would be having approx 15hg or so inhg on the FPR.
A stk FPR will regulate to approx 37-39psi with the pump running and engine off and your a bit over that with your 41-42 psi. Almost normal.
IF you put Pressure on the FPR with the pump running what kind of pressure does the fuel rail read??? I'd estimated that a stk rail would read approx 50psi doing that. I remember doing that to a stk car, stk fuel pump sometime back. I don't remember it going over that 50 psi.
Anyway maybe someone else can figure out what is going on.
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