Just a guess, but since several of you have the same issue, I think water must be sucked out from a low pressue behind the vehicle. If you reroute the overflow hose outlet see if it continues. You can plug that hose it won't matter once the tank is filled, or you could add a T to the overflow hose and add a vent hose to the T just make sure the air end is higher then the water overflow, the vent can be internal to the coach, doesn't need to go outside as long as the water path is terminated outside so things don't get wet. The part that makes no sense to me is that the end of the vent hose in the tank, would have to be underwater for it to suck out the water. ie a straw will only suck fluid if the end is in the liquid, not when in air. Is there an tube internal to the tank that goes to the bottom? Mine (which is not this model) has a over flow outlet next to the water fill inlet. both on the side of the tank, not the top. The other possibility is the tank is becoming pressurized but I don't see how. are you sure the tank drain valve is closing well. is there ever a wet spot under that drain when stopped for an hour? If it is a pull push valve, are you getting it closed all the way? The fact that many of you are experiencing the same thing still sounds like a design flaw rather then a part failure or operator error.
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