Ditto - Really appreciate the offer but I think I finally got it. Still not sure exactly what it was but it was driving me crazy last night so at about 1am I started breaking it all down again. I disassembled every valve and oring on that unit. Stopped short of taking the valve off the tank. It was on there too tight. Spent the next hour putting it all back together and it finally seems to be working correctly. Still wish I knew what the problem was but I guess it really doesn't matter now as long as it keeps working. At least if anything ever happens again I'm confident I know how to fix it. Thanks again for everything!!!