I don't know if it's ethanol or what it is but my one Fergie TO 20 is giving me fits .It sits most of the time being a loader tractor and as such the carb plugs up and drives me nuts .II's a simple Marvell up draft but it needs rodded out again .If not it will starve out when you least expect it like right in the middle of a lift .What I'm doing right now it takes a loader as I'm not nearly as strong as an old timer as I was as a younger man .Time to turn a wrench ----or in this case a screw driver ----It was brand new in 1950 I was brand new in1948----