Posted by Tom Fleming on November 21, 2014 at 08:05:45 from (67.20.239.72):
In Reply to: corn laced gas posted by bass on November 19, 2014 at 13:33:55:
rustyfarmall and Gordo, the reality is actually in the middle. Certain fuel pump diaphragms and carburetor are NOT compatible with ethanol, and some are. I can absolutely state as a fact, that NOS F12 fuel pump diaphragms fro A/C Delco turn to jelly with ethanol. Carter fuel pumps, work just fine.
Now, can you make a blanket statement either way? absolutely not. Some rubber based compounds tolerate ethanol, some don't. Butyl rubber for example tolerates ethanol to a certain extent, but is not good for extended contract. Nitrile based rubber is the best for extended ethanol immersion.
In the end, it truly depends upon the mfg'er and what they used.
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