I can't figure out why this would happen, but when I hook up to shore water I still seem to be drawing from my fresh water tank. The shore water is on which should bypass the water tank. I'm trying to figure out what might still be drawing from the tank because it doesn't seem to be the sinks. Two weekends ago when I left I turned off the AC, water pressure pump, water heater and ice maker as well as the shore water hook up. When we returned last weekend the water tank was empty. There doesn't seem to be enough water in the bilge for it to be leaking so something must be drawing from it that I'm not thinking about. Any ideas?