I just filled the fresh water tank for our first time on new-to-us 2010 Keystone Alpine. I stood inside, kept testing the water level, it never moved - and then it started to overflow at the outside. ...
The monitor panel level issue is not related to the water pump not working UNLESS there is a fuse blown and the water pump and monitor oanel power are both on that fuse. I would start with checking your fuse down at the power converter panel.