Just curious if you have tried the system with a new filter in place of the bypass. Perhaps the air is entering the system at that point? I did the same thing as you when I winterized..all air, blew out until no water was left in the coiled tube behind the vegetable bin, drained the filter and left it uninstalled.
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Clark & Peggy
2022 Montana 3791RD, 800i solar, 2x100ah Battleborn
2017 Ford F350, CC, LB, 6.7, 4x4
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