Not in a tractor but gasoline powered! And the experience is applicable to gas used anywhere.
About 2.5 years ago, my daughter bought a new to her car. The old one, a 2000 plymouth voyager has been parked beside my shop since. No special storage precautions other than adding a few ounces of Seafoam to the tank, about 4-5 gals on gas.
On Friday last week, I charged the battery, turned the key on and waited a short while for the fuel pump to get the system primed with gas and turned the key.
Darn thing started on the first crank over and runs as good as it ever did!
Now, was it the Seafoam? The fact that the fuel system is sealed? Real high quality fuel (not likely), Dumb luck?
All I know is, Seafoam goes in everything now!