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Funny I have the opposite issue, the black tank always reads empty lol. I figure one of these days I'll just pour in a measured 30 gal of water and see what happens, and then dump it at the storage yard. If it doesn't work, I'll add it to the list for the dealer to work on under warranty.
If they won't do it (which wouldn't surprise me), I'll just have to do it myself, but I'd probably replace those sensors with much better ones at that point.
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