Originally Posted by Ford truck guy
Was there a shutoff valve where the water leaked out from? If so, that is the drain hose... close that valve and try again
If there is no valve, do a search here for a known siphoning problem where if you fill the tank completely full, the water can siphon out of the overflow until you have a low tank.
There are a couple of fixes you will find if that is the case...
Larry, Stephanie Park City, Utah
2017 31SL King, 8K axles, Disc Brakes,17.5 Goodyear H tires,BU Camera,5.5 Onan, Heated HT pads, Two Uniguard Awnings, Slide Toppers, 2000w PSW inverter