Ethanol (ethyl alcohol) has several chemical properties that effects engine parts. Alcohol absorbs water and causes corrosion. Marine engines are known to be the least compatible with ethanol-blend fuels, hence why you have to add a stabilizer every time you fill up with it.
I've got good news for you, we offer Non-Ethanol fuel! At $4.99 per gallon, you and your vessel will be very happy!