Perhaps this is true, but the gasoline sure did the trick. I checked on the tank this morning and it was all the consistency of diesel fuel. What was neat to see was how rapidly the gasoline will evaporate off and go right back to tar. I used my fingers to wipe the bottom of the tank in a fast test and in one minute, watched it go from diesel-like, to oil-like, and back to tar-like.
To finish cleaning this, I'm going to drain it direct into some low-cost filter, then run it back through the tank quickly to try and pick-up and flow out as much as possible. If I can wipe out most by hand and leave behind just what I can't reach as only a thin layer, I think running some fuel additives and doing an early fuel filter change will be able to take care of the rest.
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