Cheryl, I'm glad you got your tractor up and running again. Plus, I enjoyed reading through the suggestions, especially the suggestion of "water worm."
I thought it may be a good idea to have one of these so I did some searching. The only thing I found called water worm was from a company in NZ.
I did, however, find another product that may be just as worthy. It is not to be left in a tank longer than 60 days and it is not re-useable but it may be good to use one on occasion just to prevent the issues Cheryl had. These are $20.50 each prior to shipping. Here's the link if anyone is interested.
Water Eliminator is place in the fuel tank - crystals absorbe water, protecting your engine & preventing fuel deterioration & microbial/fungal growth
diesel-fuels.com
Tractor Gal