Although it sounds like you’ve narrowed it to the FW tank, I had a similar issue with city connect. The water line coming out of the water pump and into the city-connect distribution line was leaking at the pump fitting. The back pressure from the city connect was enough to cause the leak. It was in the bottom of the pantry behind the piece of luan, so it wasn’t immediately noticeable until I saw water leaking outside under the rig. You might want to check down there out of caution. (I fixed the issue by installing a check valve in the line coming out of the pump. Problem solved.)
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2018 JayFlight SLX 212QBW
1999 Ford F-250 Super Duty Lariat SC, 7.3L PSD, 3.73
Transfer Flow 50 gal aux; Andersen WDH; Prodigy P2
😁 "If a man says he’ll fix something, he will. There’s no need to remind him every 6 months.
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