I have a 1991 Barth Regency which has two fresh water fill inlets; one labeled Manual Fill and the other Auto Fill. The Manual Fill simply fills the fresh water tank directly. The Auto Fill is the city water hookup and the auto fill. When I hook up to the Auto Fill inlet to use city water pressure, it somehow leaks into my gray water holding tank and fills it overnight. There are no leaks in faucets, shower, or toilet. I can't figure out how it gets to the gray water tank. Would appreciate some help.

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I put this question out to my list of Barth Rangers and Barth friends. The responses I got said that the autofill overflow could go into the gray water tank. So if you have a leaky autofill valve it would fill your gray water. If I were to guess, this was done because these autofill valves have been historically unreliable so the overflow went into the gray water rather than any end up on the floor

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