Today, I opened up 5 flojet pumps. I was thinking that maybe they would be easy to notice what the problem was. The majority of the problems were with the check valve assembly. I tried to piece together a couple and got three that probably will not work. But I did try. Greg, did say to just buy new ones. But maybe if I replace them with new valve assembly kits the success would be greater? I have not check them yet though. I should be more positive.