I had the same issue on our 96 Pace. My hookups are at the left rear and there is a valve to switch for filling the Fresh Water Tank. I opened and closed the valve several times and it seems to be okay now. There might have been some dirt or something caught in it not letting it close properly. I certainly hope so because it ain't
so easy to change. It is held on with a 2-hole conduit strap and the fittings are the clamp type for the tubing. I think it takes a special tool to redo them. You have to take the bottom off of the piece that the valve is mounted to. Plus there ain't
a whole lot of room to work.