I have a JD620 that i have been having problems with for some time.I noticed a few years ago i had some rust in the tank .I took the tank off and took it to a shop that cleaned the tank and added some type of product that coats the tank and supposibly prevents the tank from rusting again.Well i was running the tractor the other day and she quite on me .The settling bowl had rust. Idrained thetank of remaining gas which did not look bad.But when i looked into tank with a flash light,i noticed a lot of rust again.I have heard of having a tank glass lined, does anyone know about this procedure.What are my options with this tank,and what is the best way to store tractor over winter, drain all gas ,or add some kind of gas conditioner!Thanks for any advise you can give me.