Depending on the region where you operate your equipment, fuel formulations may deteriorate and oxidize rapidly. Fuel deterioration and oxidation can occur in as little as 30 days and may cause damage to the carburettor and/or fuel system. Please check with your servicing dealer for local storage recommendations.
Petrol will deteriorate and oxidize in storage. Old petrol will cause hard starting, and it leaves gum deposits that clog the fuel system. If the petrol in your lawnmower deteriorates during storage, you may need to have the carburettor and other fuel system components serviced or replaced.
The length of time that petrol can be left in your fuel tank and carburettor without causing functional problems will vary with such factors such as the additives in the particular brand of petrol, your storage temperatures and whether the fuel tank is partially or completely filled. The air in a partially filled fuel tank promotes fuel deterioration. Very warm storage temperatures accelerate fuel deterioration. Problems as a result of fuel deterioration may occur within a few months, or even less if the petrol was not fresh when you filled the fuel tank.
