The prime pressure is 50 psi then drops to 44psi after 2 seconds or so if I leave the guage on and the key on the pressure holds at 44 psi if I turn the key off it stays there also. I tried disconnecting the vaccum line while it is running there really was not much of a difference that I could tell. the only way to keep the car running is to "pump" the throttle. I guess I will just have to order a FPR and give that a try unless there is something else that you guys may know of. I dont remeber if I mentioned that as soon asthe car stalls the fuel pressure is right back at the 44psi.