Here's another one for you, Denis. I had forgotten about the issue with ethanol absorbing water, and releasing it, within a system. Maybe that was what GM was warning us techs about so long ago, and it may be temperature related, but our beloved Wiki explains it all right here:
Ethanol fuel - Wikipedia, the free encyclopedia
That would be section 9.1 for the fuel issues with cars...and boats...
and German cars!!! 