Run it dry. The full-tank trick is overthinking it.

Run the chainsaw dry and store it empty — the condensation argument sounds smart, but the carburetor is what actually dies in storage.

The “full tank prevents condensation” crowd is half right: empty tanks can collect moisture, and ethanol fuel absorbs water from the air. But a chainsaw tank is sealed with a vented cap. There’s not much air swapping in and out. That’s a real problem for boat tanks or open-vented mowers, not a saw sitting in your garage.

The actual killer is fuel sitting in the carburetor. The jets are tiny. Fuel evaporates after a couple of months and leaves sticky varnish that plugs them. That’s why the fix is to drain the tank and run the engine until it stalls — it burns off everything left in the line and carb bowl. Stihl and Husqvarna both recommend this for storage over 30 days.

If you want to be extra careful, use ethanol-free mix with stabilizer for that final run, then leave the cap slightly loose so leftover vapors escape. But the core habit is the same: empty tank, dry carb, done.

Your carburetor will thank you in the spring.