If you do not intend to use all the fuel within a short period of time, this is highly recommended. Add a stabilizer to both your unit’s tank and to the containers in which you store your extra gasoline. The stabilizer will prevent gasoline degeneration by neutralizing the damaging effects that ethanol has on the components responsible for combustion. When adding a stabilizer, ensure to precisely follow its instructions (ratio, etc.) and to take note of the duration it will be effective for.