Great way to get nasty build up out of the inside of your tank. Grab some "BBs" or nuts (make sure they are not stainless) drob em in your tank, throw some diesel in and slosh it around to get the crusties off the walls. Drain the tank and pull the nuts, BBs and metal particles out with a flex magnet (a flex magnet will save you tons of time & a headache!) wash it out a few times with some unleaded & you should be good to go.
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