Hi all,
I found a web page which explains why the 90% gasoline 10% ethanol fuel is ruining outboard motors on boats.
Here is the link to the site:
http://www.learntocatchcatfish.com/ethanol-in-boats-the-silent-killer/
The page does a pretty good job of explaining the issue and what you can do to prevent it.
I hope it helps because I know that some you of guys have been having problems with your outboard motors causing you to miss out on the local tournaments.