ORIGINAL: PLANE JIM
I know if I put today's fuel in any of my motorcylces, boat or lawn equipment -it tends to screw them up and almost becomes granulated when I don't crank them up every month-just pulled carb off of my boy's honda 230 for the 2nd time in 6 months it was running lean and would not idle-clean carb and runs good again -I have tried using stabil and seafoam and it still tends to crud up every three-six months if not ran. The residue in the carb was flakey and granular it looked like old pieces of tite bond glue after it has dried
I don't know what your putting in the tank but it sounds like you the problem is not the fuel. If you're going to store equipment for six months you might want to drain the tank. I have never had any fuel related issues in ten years since they have been pumping 10% ethanol in any of my cars, trucks, bikes, or lawn equipment, never once.