Ok, RB gurus, I have an 83 S130 with a brand new walbro 255, RB20, and nismo adj. fpr. The problem is when I key up, the fuel pump comes on, but as soon as I lower the pressure as read by the gauge, the needle goes wild from about 20 psi to 50 psi. My filter is new also, but my fpr might be fubar. The "top hat" section of said fpr spins, so I'm figuring that it might be the prob. Please advise.