I am a small tractor business who sells new and used tractors and equipment. I also work on customers tractors. Well I have a tractor that I am working on that has rust inside the gas tank. I know there is a product you can add to the tank which will help the filter from stopping up and seals the rust against the walls. Does anyone know of such a product? The customer is not financially able to buy a new tank for me to install. Thanks just lost in Texas.

The following should be of some help.
Kreem is made by "Kreem Products" (P.O. Box 399, Somis CA). Phone number is (805) 386-4470. Information on product container reads: "Kreem Fuel Tank Liner is designed for use as a preventive maintenance product in metal tanks, new and old; containing gasoline, gasohol, or diesel. Kreem Tank Liner has a unique formulation with extremely rapid set-up, that prevents leakage from hairline cracks and seam pinholes by coating the tank's inner surface with a fuel resistant elastomer. Not for plastic tanks. Kreem is NOT compatible with all fiberglass tanks. You must spot test before use."

I used this a few years back on a 8N and have had no problems.
Valu-Bilt (http://www.valu-bilt.com/product_info.php?product_id=10937&item_number=A%20478521)