Storage of Low Level Ethanol Blends in Small Engines
This study examined the effects of storing gasoline (E0) and low level ethanol blends (E10, E15, E20) in small engines over a 12 month period. Many variables were monitored or controlled in order to determine if ethanol blended fuels affected small engines during storage. A sample size of 64 engines was used to reduce the effects of normal engine to engine performance variations and analyze trends with the different fuel blends. For the study, 32 handheld 2-stroke engines with a cube carburetor (leaf blowers) and 32 non-handheld 4-stroke consumer grade small engines with a float carburetor (gensets) were tested. These engines were selected to represent many different types of equipment on the market and for ease of loading during the study. The engines were measured after initial purchase, after 6 months of storage, and after 12 months of storage to check for changes.