I swapped my old pressure regulator out with the new one just to rule that out. Didn't make a difference. So I figured the pump is weak. But I noticed while running vinegar through it to clean it for shipping the cylinder filled up and ran over. I wondered if the pump is good but a blockage or bad o,ring going from the pump to the regulator. Has anyone ever taken one apart? I really would like to keep it if it's something simple. I have an old pump I could look into.