I've been working on this for four hours now, and I can't get the hose off the bottom of the pump. I'm not sure what I'm doing wrong, but it's annoying to be trying to get a wrench to fit on a nut for four hours. I managed to get it to sit proper on the nut once about an hour ago, I pulled on it, and it held the way it should, so I put pressure on it to try to loosen. It might have felt like it started, but then the wrench fell off and I have not been able to get it back onto the nut since then. I can see the nut, there is nothing in the way. I can feel the wrench go on over the pipe, and onto the nut, but it won't sit down on it in a way to grab it. The other end of the pipes all came off without trouble.