I have same problem with my 2018 3721RL...parked at my lake lot with full hookups. I keep all tanks closed and only empty them at the end of my weekend. I too have a sewer smell outside on my patio after every flush. My Cougar never had the problem but my new Montana does. Wouldn’t a tank leak be dripping below the Fiver? If vent is plugged how could you smell it outside?
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2018 Montana 3721RL
2018 Ford F350 6.7 Turbo Diesel
Life Comes Down to a Simple Choice..Get Busy Living or Get Busy Dying
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