+1 on the E10 sucking in water. E10 in a vented tank acts like salt in a saltshaker on a humid summer day--it absorbs moisture from the air. It gets worse as the weather gets cooler and more damp.
One gallon of E10 is really 0.9 gallon gasoline and 0.1 gallon ethanol. The ethanol can absorb its own volume in water, so that gallon of fuel will swell to 1.1 gallons (0.9 gas + 0.1 ethanol +0.1 water). Then the water/ethanol suddenly separates out as a layer at the bottom.
I wash the ethanol from my gasoline by adding water to the gas can (10% by volume), shaking, and letting set overnight. Then I pour the gasoline off the top, leaving the water & ethanol behind. The gas you pour off the top will be *very* dry, and ethanol-free. I lose a couple of octane points, but these old tractors were made for 70 octane fuel to begin with.
I only do this for long-term storage in the winter. In summer I burn through gas fast enough that I just use the E10 as-is because it never sits long enough to be a problem.
The additives are really emulsifiers that just allow the water/ethanol to mix with the gasoline at a higher ratio. If let to set overnight, they will still separate out, giving you a layer of water on the bottom of your tank.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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