Hey guys, I have a 97 mustang v6 and I have just dropped in a Kirban Billete Fuel Pressure Regulator. I was kinda skeptical about what my car was having issues with and I decided to go with the FPR. So anyways getting to the point, I tested the pressure after I installed the part and I cant seem to get the specs on what the pressure should be with the vacuum line on and then with it off. I have set it to 38 psi with the line off and now I am thinking that it should be 38 psi with it on right? I have searched the web for almost 2 hours now and I keep getting mixed feedback so I hope you guys can clear this up. On another note, when I set it to the 38 psi with the line off, the pressure went way down when I replaced the vacuum line back on. It went from 38 psi to 22 psi is this normal? Now I am thinking that it might be my fuel pump. I know its suppose to drop some but not that low right? Any feedback over this would be greatly appreciate it. Thanks in advance.