Re: 95 gt 5.0 fuel pump ?
Fuel pressure should be set with the vacuum line to the regulator disconnected.Set it to 38 - 40 psi at idle.
Something I noticed once when changing out an in tank fuel pump:
On some, maybe all in tank pumps there is a small metal collar on the fuel pump discharge fitting where you connect it to the fuel line rubber hose.
Sometimes when removing the fuel pump, but not the hose, I noticed that the small metal cap can come off and remain inside the rubber hose.
As long as you change out the hose too, it will not cause any problems, but if you don't and that metal cap stays in the rubber hose when you install a new pump, it will disrupt your fuel flow and your engine may not get enough fuel from your new pump.
After discovering that issue, I always wondered how many times that may have happened to people causing unexplained problems with their cars.