I have problems with the caps on both my Stihl FS-90's. I talked to my dealer and he actually told me that he had the same issue. A few times they sent trimmers out the door and customers complained because they leaked gas all over the place on the way home.
It was a bad idea. According to my dealer the feedback Stihl has gotten on the caps is terrible. Yet they continue to use them. Its almost like they are trying to spite their customers. Im not asking that they recall anything. Just start using the old caps and tanks on future production.
If you guys really want to get something done about this, dont complain to Stihl. Complain to the EPA. Im sure they would love to hear about trimmer tanks that dump 2 cycle gas everywhere.
I do not do this for the love of the game. I do this for the money.