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I don't have much experience on the bubbling thing, but have read many posts about don't dump until it bubbles (for those who want to fill it up and we know the gauges don't work). So to me it sounds like you haven't dumped both tanks (assuming there are 2). Since it is a 2020 model, I thought perhaps you were somewhat new with rvs or at least this model.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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