I dumped the gas out of a very low hour saw to send it off and have it tweaked. I used a plastic dish pan to catch the gas and I was Shocked to see how much crap(sawdust) that came out. I am like crazy careful when fueling, to the point where most of you would think I was "over the top too careful" when refilling. I doubt if the cap has even been off ten times. So, where did this $hit come from, and/or how did it get in there? I KNOW it wasn't in the jug. I know this for fact. It's a Stihl 261, could it get in through the vent? I would like to hear what you guys have to say. Thanks, DW