Well, I changed out my corroded fuel line today. I replaced it with fuel injection hose. Anyhow, I decided to try out the new alchy system and was popping at around 10psi to 18psi. I could run 18pis w/o knock w/o alcy before. I am certain it is not the alchy causing problems. O2's were low 800's. F/P did go up with boost. I took her home and as soon as I took out the key, the f/p went down pretty quickly. I did not see any leaks. I am wondering if my gauge is off or my pump or reg. is faulty? Can I test the regulator with a vacuum gauge? I did close off the supply holes with my fingers and the reg. will not hold vacuum. This is with reg. off, of course.