The check valve could be stuck open. Are you running the water pump while on city water? this has also been reported as keeping the check valve open and allowing water to backflow into the tank.
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Jay & Maria - Camp Dog Joplin
2018 Cedar Creek Champagne 38EL
Fulltimers since May 2018!
2017 Ford F350 Crewcab Dually Diesel
Officially homeless and loving it.
Ham Callsign K9NDY
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