No kids vint_mow. What gets me is the mower next to it has the same fuel in it and is fine - maybe its something about the metal tank as the other is plastic.
Never had this problem before with the same brand 98 Ron. I have left a quantum motor 6 months and still ran. Around the 7 month mark the fuel will go off (as in won't fire) but never clogs anything - thats why I use it