I recently opened a tank that is only a couple years old. The brass inside the tank literally crumbled. I've never had that happen before. I'm wondering if it's the fuel I'm using or if the brass is a different composition than I've used before. I'm thinking it's the fuel, but I'm not using anything much different than I've ever used. Wildcat 15% premium (synthetic/castor). I might just try out the copper tubing.