Welcome to the forum!
Did you have the water pump on when putting water into the fresh water tank? (I just saw you said you didn't). The city water connection and the fresh water tank inlets are isolated from each other as far as I know except via the water pump.
Are you sure you didn't just have residual water from the leak at the city connection continuing to drip? Where was the water inside the trailer? Where did that come from/potentially come from? Have you turned on the water while looking under the bathroom sink (or wherever the fresh water inlet comes in) to see what/where the leak is?
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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