been known for a lot of dumb things, yet another....fueled up my M8540 & brush hogged for an hr or so. when i returned, i saw that i had neglected to replace the fuel cap (laying close to the fuel inlet)....so w/all that dust, etc. an uncovered fuel tank !!!!! tank was around 3/4 full about 15 gal. debating what to do, i finally decided to drain the entire tank :-( clean the strainer bowl, & replaced fuel filter. flushed out tank w/about 1 gal fresh fuel. the fuel looked clean but......is it possible for very fine dust particles to slip by the fuel filter? not good. all a question of microns i guess.....did i throw my money away? feel confident it's a clean system now....:2cents: thx