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JMW

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Reply with quote  #1 
I have a new 2017 Etec 150. Going on 100 hours according to my boats hour meter. I refill tank on a weekly basis. I do use 10 ethanol fuel. Should I run a tank with Evinrude fuel system cleaner for the injectors. Read a lot of problems with the injectors. With my old motor I used to switch over to non ethanol gas in fall for winterization. Have read that it is better to stick with one or other because of phase separation if mixed. I always ran tank down as low as possible before making switch. Non ethanol fuel is always 91 octane in my area.
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JMW
jimh

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Reply with quote  #2 
Mixing gasoline with ethanol-gasoline blended fuel does not cause phase separation. Phase separation occurs when the fuel has too much water in solution.

Fuel System Cleaner is for periodic treatment. Running ethanol-gasoline blended fuel is somewhat akin to continual fuel system cleaning due the enhanced solvent property of the blended fuel.

My own preference is to minimize use of fuel additives in routine operation other than Evinrude 2+4 Fuel Conditioner.

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JMW

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Reply with quote  #3 
I do have a water separating filter on my boat. Filter is changed each spring. Boat is only out of use for about three months. I burned up a piston in 2004 Johnson 140 four stroke late November 2016. It ocker up and was scoped. Cause was probably bad/lean fuel injector. Do not want that again. Was running perfect until it locked up when starting.


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JMW
LourPitcher

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Reply with quote  #4 
Quote:
Have read that it is better to stick with one or other because of phase separation if mixed. I always ran tank down as low as possible before making switch.


My information supports your concern and the information you are reading.

Seems best not to dilute a tank of ethanol blended fuel with non-ethanol fuel as it produces a mixture having < 10% ethanol. 

The concern is that mix lowers the quantity of ethanol molecules in a full fuel tank available to bond safely with introduced water molecules and prevent the point of phase separation being reached.  An ethanol molecule if bonded with only a a single available water molecule does not separate and can be safely passed through the water sep/fuel filter into and through the E-TEC while sharing a common outer electron. 

But a user created full tank of mixed fuels (now having only 5% ethanol for example) seems would be more susceptible to phase separation (permitting less amount of water introductions) than a full tank of E-10.
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