1996 k2500 w/ a 454 suburban easy question

heres my problem forgive me i'm sure this has been posted before.
it has a hard time starting just turns over. takes 3-4 times to get it going i checked the fuel pressure with the ignition on and it is at 0 psi. when i get it started the fuel pressure is at about 30 psi at idle. i pretty sure it is the fuel pump just want to make sure before i replace it.
thanks

Welcome to AF, 60 psi is required

Check the pressure regulator. Removing the vacuum hose from it or pinching off the return line should increase the pressure significantly. If not, suspect the pump.

ok i replaced the fuel pump and am getting about 52 psi while running but when i turn the ignition on i still get no pressure till i start it up

How does it start with 0 fuel pressure at the rail, something is not right in the check out results. The injector poppets will not activate under about 58 psi.

i found a plug unplugged. i plugged it in now when i turn the ingintion on the fuel pressure goes up to about 50 then drops to about 10. once started it maintains about 50.

i'm sure it has to be the fuel pressure regulator but i can't seem to find it's location. anyone know where it is located?

Inside/under the upper intake plenum.

fuel pressure regulator was the problem. changed it works good