I just put this pump in not but 2 weeks ago. Car was doing great until fuel pressure droped to 25-30psi. Key on only goes to 28... I can get the car started with starting flued only (I did this once just to see)..You think this is a bad pump, regulator, relay, maybe even filter? I also replaced injector seals...

 

Sounds like maybe the hose inside the tank that connects the pump to the steel line might have a leak. Does the pressure drop right down after it builds pressure? It should hold for a few minutes before it drops.

 

Pressure regulator could be going as well but normally that would allow for to much fuel pressure.

 

Replace the filter first. You should have replaced it when you replaced the pump. You could have an obstruction in the fuel line. The injectors would not affect fuel pressure, unless one is leaking. The relay is not at fault, because the pump is on, you just have low pressure.