So I believe i finally resolved a fuel leak in the cab of my 66 that has been going on for years. Every time I take it for a drive and then let it sit with the windows up you would gag because of the gas fumes. I've tried every gasket and the leak would just continue. The other day I pulled the Sender and found a crack at the solder joint where the fitting is attached to the sender. I pulled a vacuum on it and it was leaking. To resolve the problem I heated the fitting up on my stove at home and removed the fitting. While it was hot I hit it with a wire brush added flux and re-soldered it. Ta-daaa no more leak. Next I made a new rubber gasket and all is well.