Back on topic do you leave gas sitting in the tank for any length of time? Also what oil do you use? Some oils will separate from the fuel and could possibly build up on the inside of your tank.
This fuel only sat for a couple days, and Im using either Husky or Stihl synthetic oil. (have some bottles of both, don't remember which I used on that particular bottle.)
I'll post a pic after this weekend. Its really strange.
I used the same gas in a couple other saws as well, and the tanks are clean, which leads me to believe that theres a clump of stuff that just fell in when I was fueling, and it settled to the bottom when it sat there for a few days.