Gasoline left in a leaf blower goes bad in just 30 days because volatile compounds break down when exposed to air and moisture in permeable tanks, House Digest reported. This chemical breakdown turns the fuel into a thick varnish that clogs carburetors, causes engines to stall, and ruins fuel filters.
Why does gasoline go bad so quickly in a leaf blower?
Gasoline is a highly volatile mixture that loses its potency rapidly when stored in small, vented equipment tanks. Because leaf blowers feature permeable tanks that remain exposed to air and moisture, octanes in the fuel degrade. This process creates a thick varnish that prevents proper ignition and overstrains the engine.
House Digest noted that storage in hot or humid environments accelerates this weathering process, a finding confirmed by a 2016 study undertaken for the Renewable Fuels Association. When fuel sits in these conditions, it fails to ignite properly and can leave behind stubborn brown deposits inside the assembly.
What damage does ethanol phase separation cause to small engines?
Modern standard pump gasoline contains 10 percent ethanol, known as E10, which complies with government regulations aimed at reducing greenhouse gas emissions. Ethanol is hygroscopic, meaning it absorbs moisture from the surrounding air over time.
When blended fuel sits in a tank long enough, the ethanol separates and settles at the bottom. Unlike automobiles, the rubber seals and internal parts of leaf blowers are not built to resist this corrosive mixture. The separated ethanol blend dissolves and deteriorates these components, and manufacturers typically void equipment warranties when this type of damage occurs. A study by the Renewable Fuels Association found that phase separation takes about three months to materialize fully.
How can you protect your leaf blower engine during storage?
Owners can prevent fuel degradation by emptying the gas tank entirely before storing the equipment for the winter. After decanting the remaining gasoline back into its original container, operators should run the blower without the throttle until it sputters shut to clear out any leftover fuel.
Alternatively, adding a fuel stabilizer neutralizes moisture before it can react with the octane. A five-year experiment conducted by the YouTube channel Project Farm showed that STA-BIL fuel stabilizer performs well in maintaining gasoline potency. However, recommendations on storage duration vary widely among manufacturers. Stihl advises against storing stabilized fuel beyond 60 days, while Briggs & Stratton states its fuel preserver can extend usability for up to three years. Fuel stabilizers cannot revive gas that has already degraded. Owners who prefer convenience can also purchase ethanol-free synthetic blends like Stihl MotoMix for two-stroke engines or Moto4 for four-stroke engines, which remain stable in the tank for up to two years.
Frequently Asked Questions
What octane rating do leaf blowers require?
Leaf blowers require fuel with an 87 octane rating to achieve adequate performance. When fuel degrades below this threshold, the engine often stalls or fails to operate entirely.
How long does ethanol-free fuel last in storage?
Ethanol-free fuel blends like Stihl MotoMix and Moto4 can be left inside a leaf blower tank for the winter and will not spoil for up to two years.
What temperature zone should you store a leaf blower in?
Equipment should be kept in a frost-free zone because high heat and humidity accelerate gasoline weathering inside permeable tanks.
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