Dump your fuel from what's left in your saw into a clear container.
See if it's got water that settles on the bottom or if it's cloudy.
If there isn't any, that doesn't mean that there wasn't any. It may have all gotten sucked up and burned through the engine, and thus, the evidence is gone.
Usually the last bottom bit of your fuel can is what will be most likely to contain water condensate.
There is enough humidity present in the air in Fla to absorb into the alcohol in fuel. If it reaches a high enough percentage, it will separate and drop to the bottom of the fuel tank.
This alcohol and water mixture will be burnable, but will not contain oil, as it won't mix with the water.
The fuel pickup is also at the bottom of the fuel tank in a saw, so it gets sucked up all at once.
If you have a fuel can in Fla that's been sitting for close to a year, chances are there is some small percentage of water dissolved in the fuel. How much is determined on where it's stored, what kind of container, and how much it's opened, or vented. Not to mention, what quality the fuel was to begin with.
Stihl recommends mid-grade fuel in their saws.
That's just food for thought....
