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I have a 2018 Montana3721RL. First time i took it out, same issue. Took it to shop and they later advised they fixed it. Next time ot, same deal. Finally stumpled in to a utube factory walk-thru and during that video, the guy noted on some models, 3721 being one, that to drain tanks you needed to raise the front to max level. Bingo, fixed the issue. Dealer didn’t even know it. Maybe you need to try it.
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