I brought an old walking tractor back from the grave. Two months ago it ran great, then I let it sit until a few days ago. It ran for a few seconds and then that was it. When I pulled the fuel line to see if I had gas getting to the carb the fuel that was coming out looked like pink paint. Even with a fuel filter it went right through it. The old metal tank obviously needs some attention. Used plastic ones on ebay are $40. Similar used metal tanks are selling for $64. I only paid $30 total for the whole machine!! Has anyone had any look cleaning an old metal gas tank on an old Briggs?