I was in Superior Wis on Tuesday this week and stopped at a BP truck stop to fuel up. As I was filling up the GMC I noticed a label on the pump warning, to the best of my recollection, that ethanol blended fuels should not be used in small engines, boat motors etc and the only fuel that should be used is the premium which did not contain ethanol, at this station. Wisconsin law might require this label (or the station is protecting themselves from liability by forewarning motorists) because it also stated something to the effect that Premium fuel was not to be used except in vehicles that were not specifically required by the oem and by those vehicles as mentioned below.
The following piston engine applications should not use ethanol blended gasoline: (this was not on the pump, found this online)
- Any 2 cycle engine used in tools, watercraft, snowmobiles, etc., or small 4 cycle engines.
- Any engines used in an emergency stationary engine application like a generator or a pump, especially in a humid climate.
- All watercraft. Ethanol blended gasoline should never be used in a marine environment.
- Antique and classic cars and classic motorcycles.
- All aircraft.
The fact that is was used and nothing ever happened is not proof of future problems or undetected damage already caused (carbon build up from the fuel).
Many new vehicles have computer systems that sense and correct for high ethanol content. Small engines and most power sports equipment are not programmed to detect this and a lean burn situation results.
If you live in a state without a mandatory ethanol blending law, you have no exemptions, ethanol will eventually be blended into all of your unleaded gasoline and there is no requirement in EISA 2007 to label gas pumps with ethanol content. Michigan has no law that I can find as of yet and states that do, list exemptions and require that fuel pumps be so marked to be able to avoid ethanol in vehicles mentioned above and provide a means to punish those that use the non-ethanol fuel in vehicles that are supposed to use it.
So the bottom line, in Michigan you are never sure the fuel you are buying is ethanol free.