how about cutting a 1 inch wide strip down the side of a barrel and gluing in a glass strip with some kind of glue that can hold up to the required use? I could always bend the bottom into a bowl shape and put the drain in the center of that. The lid of the barrel could be put back on and let it settle for however long it needs. I figure for a large mix it might take overnight to settle out all the way.
I am really not worried about the small amount of water in the gas that is left over. Like I said I ran water injection for a long time with 10% ratio to gas. It didn't do anything except clean out the engine and make the internals look new. If I could get 10% water suspension somehow I would have the perfect setup. But all the chemicals that would let you suspend water in the gas were pretty rare and a lot of trouble to get. 10% water 90% gas would always get me 10% better mileage and a bit more power, my old setup was just really unreliable and hard to maintain so I gave up on it.
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