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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 505707" data-attributes="member: 3438">I ran only non-ethonal in my Mercuiser and so far with the pontoon 150 Merc.  Ie dealer said to only run that and given it does not have the big water seperating filter, like the Yamaha, will continue to do so.   The Merc has a different fuel system, with this "on demand" valve.  ie fuel tank is under vacuum to prevent venting of "harmful" gases.  New EPA requirements?   The problem I had with the older outboards was the phase seperation after the water had been in there a while.  The white foamy stuff would clog the on board small filter.  I did not see any of that in the yamaha fuel bowl.</blockquote>