Fuel over 30 days old will deteriorate, causing starting or running problems and may damage the fuel system.
Use a fuel additive or Aspen fuel to increase the storage time available.
Aspen fuel lasts up to 5 years without any additional additives.
Fuel additives / stabiliser extends fuel life to last between 3 months to 2 years.
The manufacturer facts
Briggs & Stratton
Fuel will become stale when stored over 30 days. Stale fuel causes acid and gum deposits to form in fuel system or on essential carburetor parts. To keep fuel fresh, use Briggs & Stratton Advanced Formula Fuel Treatment & Stabilizer.
There is no need to drain gasoline from the engine if a fuel stabilizer is added according to instructions. Run the engine for 2 minutes to circulate the stabilizer throughout the fuel system. The engine and fuel can then be stored up to 24 months.
If gasoline in the engine has not been treated with a fuel stabilizer, it must be drained into an approved container. Run the engine until it stops from lack of fuel. The use of a fuel stabilizer in the storage container is recommended to maintain freshness. It is also recommended that fuel is purchased in quantities that can be used within 30 days. This will assure fuel freshness and volatility tailored to the season.
Honda
If you don’t plan to use your Honda powered equipment for more than 30 days, follow the storage guidelines on the following page. Untreated gasoline (without a fuel stabilizer) left in the engine’s fuel system will deteriorate, causing starting or running problems and, in some cases, damage to the fuel system.
Storing Your Honda Powered Equipment for More Than 30 Days
If you don’t plan to use your Honda powered equipment for more than 30 days, follow these steps to reduce fuel-related problems.
Storage Time: 30 to 90 days
1. Add gasoline stabilizer to the fuel tank following the manufacturer’s instructions. When adding a gasoline stabilizer, fill the fuel tank with fresh gasoline. If only partially filled, air in the tank will promote fuel deterioration during storage.
Note:
All stabilizers have a shelf life and their performance will deteriorate over time. Fuel stabilizers will not reconstitute stale fuel.