Yes, lots of the old tractors came from the factory as an (All Fuel) model. These are considered sort of rare now. I have had several John Deeres up to 1959 models that were (All Fuel)
They had a one gallon tank for gasoline to start the engine on, and a big tank for fuel, then a lever to switch it over to tractor fuel (sort of like kerosene back in day. It was cheaper than gas and you would plow all day on the fuel. The engines were a lower compression and maybe a different carb. Also it produced a little less horsepower.
But those old things would run on just about anything you put in it. They did have a petcock on the side of the oil pan to drain off excess fuel that made it's way into the oil pan. You would just open it up and let it run out until it reached the petcock level. Then close it up and go to plowing again!
