I just put the B&M FPR and guage on my car, and when I remove and plug the vaccum line to the FPR, the fuel pressure needle will just bounce around whatever value I set it to, (Same results with the line plugged in and I pull the throttle cable to WOT) Correct me if I'm wrong, but shouldnt the needle go up a few lbs. When the vaccum line is pinched? The car runs, it is a little hard to start when it is cold though, and it doesn't seem to have the pull up top that it used to. Any suggestions? Thanks.

p.s. I tried searching

 

Sorry, but I had a hard time understanding what you are trying to say.

If you take the vacuum hose off, the gauge should jump about 10psi. You should adjust the fpr with the vacuum hose off. In other words if you want 40psi, set it to 50 when the hose is off.

 

That's the problem, If i disconnect the vaccum hose, the pressure doesn't jump anywhere, it just sticks to whatever value it's set at with the line on. e.g If I set it at 45 with the line on, and I take the line off, it's still 45. and vice versa.