Can stored gasoline be used in small engines?

Fuel Compatibility

When using stored gasoline in small engines, it’s essential to check the fuel’s octane rating and ethanol content. Most small engines, such as those found in lawn mowers and chain saws, require mid-grade to high-octane gasoline (89-91 octane). However, some engines may require premium gasoline (91-93 octane) or even high-performance blend (93-100 octane). It’s also crucial to note that gasoline stored for extended periods may degrade, which can affect engine performance and potentially cause damage.

Fuel Storage and Age

Gasoline stored for more than six months may break down, causing problems with engine performance and potentially leading to engine damage. This degradation is due to the natural oxidation of gasoline, which can cause the formation of gums, varnishes, and other contaminants. To determine if stored gasoline is still usable, inspect the fuel for a clear, colorless appearance. If the fuel has an off-color or has been stored for an extended period, it’s best to err on the side of caution and use fresh fuel.

Engine Preparation

Before using stored gasoline, ensure the engine is properly prepared. Start by draining the existing fuel from the tank and fuel system. Then, use a fuel additive specifically designed to clean the fuel system and prevent engine knock or pinging. Fill the tank with the stored gasoline, and be sure to use the correct fuel type and octane rating for the engine. Running the engine for a few minutes to circulate the new fuel will help ensure the engine runs smoothly and efficiently.