I think there's 1 or 2 most likely culprits. I've read where where several units with the "convenience center" used for filling fresh water tank and providing city water thru a valve will have a failure of that valve. The valve may need to have the seals inside replaced.
. Second issue could be a failed check valve in the fresh water pump. Both systems use the same water lines downstream of the pump so to keep the water from "backfeeding" into the tank.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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