Did you try turning OFF what you turned ON to get hot water to see if that stopped the fw tank from filling. There should be a valve between the pump and the fresh water tank for winterizing but you could shut that valve off to stop water from going to the tank. There should be a check valve in the pump that stops water from flowing back through it.
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Tom & Cheryl Brockman S.O.I.T.C. Charter Member
2015 39DBRS3, Truma water heater, 2inch lift, custom paint
2011 RAM Cummins 3500 Dually
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