If your mh has the Anderson kantleak valve system, then the valve might be the issue. The valve has a couple of rubber "o" rings that can get loose from there position which will cause the valve handle to either become stuck or allow city water to fill your tank when you have it set for city water and not the tank. You can remove the valve by watching a YouTube Video to determine if the rubber "O" rings are either out of place or have torn. A replacement valve runs about $35.00. It is an easy fix you can do yourself.
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