It Does Prefer Diesel
Yes, I accidentally put gas in the tractor. It only ran for about a half minute before it stalled, so there was no damage.
A grand repairman was here when I got home from school. He drained the tank and the lines. I had to go get a fresh can of fuel, but that was OK, since I was sure this time I had diesel.
My little tractor is now happy and snug back under the run-in roof, ready, willing, and able to handle all my little chores--and snow should we get some.
If you look carefully, you can see it smiling.