old: After all that, I'd be starting to look for a new source of gas. We can all get a bit of water once in awhile. My tractors are bad if I happen to leave them half full, especially in times of changing temperatures. Even then, if I drain the bowl couple of times, solves the problem. The water will go to the lowest point, thus even with a flat bottom tank, if you park tractor so tank outlet is low, water should come out. Another possibility, some tractors have been fitted with a stem from sediment bowl, that protrudes up into tank some. While this may seem like a good idea, it does collect dirt and moisture. I would cut that stem off, so flush with bottom of tank. Problems with that stem up into tank idea are two fold; one tractors rarely run on perfectly smooth surface, thus that layer created on bottom of tank keeps moving, secondly the layer of sludge rusts the bottom of tank. That idea may work for storage tanks that never move. You can have a tap on the low end for draining off water from time to time. In fact if you have on farm storage, with no provision for draining off water, that could be source of problem. Water is now up to pump stem. Remember that old slogan on IH fuel caps, " Buy clean fuel and keep it clean. "
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