Of course, the other causes could be that the seam around the top of the black or grey tank have opened up, the valves operating either tank are leaking into the belly, or the output plumbing has a joint not glued or failing. Bottom off will tell you a lot...but I would first look infrom the top to see how things look from inside the basement. By the way, does the basement smell worse than what you smell inside? It should if it is a tank issue. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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