Does your vehicle, lawnmower, leaf blower, or any other machine run on an ethanol-gasoline blend? If it does, there's something you should know that this type of fuel is unfit for use, especially in smaller engines. Although ethanol-infused gasoline has lower emissions, ethanol can lead to a vapor block in the carburetor because it causes gasoline vapor pressure to increase. Moreover, ethanol damages seals and undermines the lifespan of components like the engine.