Is it Safe to Leave Fuel in a Lawnmower Tank? Risks from Storing Lawnmower with Fuel in a Cold, Poorly Ventilated Shed

Short answer

Context

Homeowners want to avoid engine problems in spring and ensure the safety of their family, pets, and property while storing outdoor equipment over winter.

When it might be safe

• If you add a fuel stabilizer and tightly seal the tank
• If the shed is well ventilated and pets are kept out
• If you check the tank for leaks before and after winter

When it is not safe

• Dangerous vapors can build up and leak in an enclosed, poorly ventilated shed
• Degraded fuel may gum up or damage your lawnmower engine
• Spilled or leaking fuel can pose harm to pets if they enter the shed

Possible risks

• Fuel can break down in cold conditions, leading to hard starting or engine damage
• Minimal ventilation increases the risk of combustible vapor accumulation
• Fuel leaks or fumes may create a fire hazard, especially if heaters or electrical devices are nearby

Safer alternatives

• Drain the fuel tank before storage
• Use a fuel stabilizer if you must leave fuel in the tank
• Store the lawnmower in a well-ventilated, pet-proof area

Bottom line

Storing a lawnmower with fuel in a cold, poorly ventilated shed may be risky, especially for first-time homeowners with pets. Take precautions like draining fuel, adding stabilizers, or improving ventilation to help reduce these risks.

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