My tanks are also 40 gals. US. My sensors also fail to be accurate, but I know that is not at all unusual. My bathroom sink is connected to the black tank but not the kitchen sink. I routinely get 5-7 days when dry camping and we do that a lot. It is indeed odd that your kitchen sink is connected to the black tank. The black tank flush system really helps to keep the black tank sensors working okay.
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Gulf Stream Sun Sport Ford 460 w/banks
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