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Interesting how this conversation pops up every once in a while. I think we have been through this a couple of times now. Although we are rightly concerned about the quality of fuel we use in our vehicles, the modern engine really has no relation to engines of the past with regards to fuel. If your engine has been designed to run with up to 10% ethanol then no harm should come of using it. The engine in my truck can use 85% ethanol supposedly with no harm, then should I be concerned with putting 100% gasoline in it? Anyway if you are truly questioning what you are getting from your favourite fuel station, then there is a relatively simple way to check.

  1. On a small bottle six or seven inches tall, make a permanent line about two inches from the bottom.
  2. Fill with water to this line, then fill to the top with fuel.
  3. Seal it close, agitate it, and let it stand for some time

The ethanol and water will mix and separate out together. If the water level appears to have increased, the fuel contains ethanol. Ethanol percentages of less than 5% can sometimes give a reading below the line. Therefore, any deviation in the water line indicates the presence of ethanol and should serve as a basis for rejecting the fuel.


From the website Petersen Aviation | Auto Fuel STC


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