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In recent years, small engines have run into issues
due to federally mandated changes in fuel
requirements.
This deals with the "Oxygenated" fuel that are
becoming more common in the country.
This started back in 1990 with the clean air act.
Clean Air Act 1990 requires gasoline to be modified
with oxygen additives in nonattainment zones.
Nonattainment zone: areas of the country that
exceed ozone levels.
There are Two common additives;
Alcohol
Methyl Tertiary Butyl Ether (MTBE)
Alcohol
Two types
Ethanol: distilled from grains and sugar containing
plants
Methanol: distilled from natural gas
The addition of alcohol to gasoline increases the
available oxygen during the combustion process.
Up to 10% ethanol acceptable for most small
engines.
Methanol is not normally recommended for small
engines.
MTBE
Removed from market because of health concerns.
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