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Most likely problem is the check valve at the water pump letting water back flow to the tank. The way I solved the problem on 2 or 3 RVs was to put a manual quarter turn ball valve in the pump outlet. Just remember to open it if you plan to use the tank water.
Ken
__________________ Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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