What Can I Put in My Lawn Mower Engine to Keep It Running Smooth?

The Problem

• The fuel used in lawn mowers is the same as that used in cars. Today's gasoline contains corn-based ethanol, other alcohol blends and seasonal additives. These ingredients tend to clog the smaller fuel lines and carburetors of gas-powered lawn maintenance equipment if the fuel is left unused in the tank for an extended period of time. The additives do not have the shelf life of other fuel components and tend to break down, separate and gum up engine components.

The Stabilizer Solution

• Look for a fuel stabilizer product that you can add to the fuel in your lawn mower's tank. These additives are designed to extend the shelf life of ethanol for as much as six months. It is important to read and evaluate the research data provided by individual gas stabilizer manufacturers in order to obtain optimum results. It is important to keep in mind that fuel formulations are constantly changing, so independent test results on stabilizers must be current as well.

Additional Recommendations

• Besides using fuel stabilizers, there are several ways to keep your lawn mower engine running smoothly. Buy small quantities of fresh fuel, and store it in ultraviolet-protective, plastic containers. Keep your fuel containers away from direct sunlight and areas of high humidity. Avoid using metal containers that may rust internally and react negatively with modern fuels. Promptly cap your tank after fueling to prevent fuel evaporation. Run your mower to empty all fuel at season's end, and add fresh fuel in the spring.

Other Considerations

• Contact your local lawn mower engine manufacturer or service dealer to determine whether your lawn mower would benefit from the installation of an in-line fuel filter. These filters should be changed regularly to prevent fuel-based contaminants from clogging your carburetor. Your engine air filter should also be regularly cleaned or replaced to prevent the intrusion of dirt through your mower's air intake system. Most lawn mower engine manufacturers offer on-line contact information should further information be required.