Fuel problem diagnosis help

Alright i went to start the car for the first time in about 2 months and it took it a while to start. I put a fuel pressure gauge that goes to the cowl panel to monitor fuel pressure from the shrader valve. I also put on a kirban adjustable fuel pressure regulator. well when I start the car and get it going, it only goes up to about 16psi. when I rev it, it gets a little more, but no matter how much i positively adjust the fpr, that is as high as the psi will go. Also when I shut the car off, the pressure leaks down fairly quickly. I am guessing a leaking injector or check valve on the fuel pump but am unfamiliar with this problem. Oh yeah, also when i shut it off, it sounds almost like a tire losing air, can't really diagnose where it's coming from but want to say the back of my car.

Thanks in advance guys


Did a cel test and did the injector test after and came up fine

anybody?

yeah, i've gone through adding and taking out pressure all the way both ways to no avail. i know the seals on the injectors are good too, as I replaced those recently as well. well i bought a 255lph pump not too long ago to put in, just waiting for good weather, maybe i'll stick that in and see what happens.