Rust in fuel tank 540B

Have large flakes of rust in fuel tank, so bad screen came off valve. Would like heaver duty screen to screw into bottom of tank, anyone know of such a fitting, is 1/2 NPT. Have cleaned tank as best I can without removing. Thanks.
 
If you've cleaned it as best as you can and there's still large flakes of rust then you need to try harder. Replacing the screen, even with a heavier duty screen, isn't going to help in the long run. Sounds like you need to remove the tank from the tractor and fill it with gravel, or lengths of chain, or nuts and bolts, and then roll it around until it comes clean when you rinse it out. Do a Google search on cleaning a rusted tank and you'll find as many opinions on how to do it as there are folks who have done it and felt like posting about it. Once you have it good and clean then you can use a good quality tank coating, like pore 15 or KBS or any of a number of others. As long as you clean it good and follow the prep and coating instructions that come with the product it should keep it from rusting in the future. If you just remove the rust that's there and do nothing to prevent it from coming back, it will come back.
 

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