John Deere 4010 Diesel fuel tank. Original metal fuel tank from a John Deere 4010. I was going to use it on a 4020, but the 4020 air cleaner is bigger and it wouldnt fit without modifying. The inside is fairly clean with very little rust. One spot on the outside had light pitting but I put JB weld over that and then painted over that. I would guarantee it to not have any leaks. If someone has a 4010 that needs a fuel tank, this would be perfect for you.