I bought a cub yesterday supposedly to help settle an estate. It is a pretty nice old cun with good tires and a fast hitch. I was going to try to start it this mor4ning. I found the carb, settling bowl and fuel line clogged with black sticky thick goey gunk. This stuff has to be scraped out and that is a job. Carb cleaner won't touch it till the bulk of it has been removed, I've heard of putting sugar in a gas tank to settle a score but have never seen the results. I have spent 4 hours just on the carb and settling bowl. the gas lines get thrown away as cleaning them would be much more trouble than they are worth. Did someone sugar this tractor?