These days, Government mandated corn ethanol content in pump fuel is an increasingly important topic of discussion when it comes to small engines and the negative effects that ethanol has on small engine fuel systems. As the content percentage of Ethanol in fuel increases, so does the frequency of ethanol related problems in small engines. In the last five years, There has been a steady rise in the number of ethanol related problems in small engine fuel systems including corrosion, stale fuel, foreign deposits, varnishing and carburetor damage. The small engine repair industry continues to report a growing number of ethanol related service repairs. Small engine manufacturers such as Honda and Toro are hard at work developing improvements in small engine design to combat these issues. While there is no clear permanent solution in sight, There are steps you can take to avoid these issues and help keep your lawn mower, string trimmer, chain saw, and other small engine powered equipment running reliably without needing costly repairs.