According to McMaster Carr:
http://www.mcmaster.com/#about-o-ring-materials/=mnd19n
Viton is Excellent for gasoline but poor for alcohol so with more and more
ethanol being added to the fuel this may not be a good choice. Neoprene is
only fair with gasoline but good with alcohol. Polyurethane is good with
both but rates poor for compression set. It looks like flurosilicone is the
best choice. If you can find any.
Dave
In a message dated 5/7/2013 11:01:25 AM Central Daylight Time,
fogbro1@comcast.net writes:
> What is the recommended for 'O' rings exposed to fuels with ethanol
> content?
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