I just replaced the tank on 1967 R/T due to seepage of factory welded seam. It has always done this on my 30 year old tank to a lesser degree. It got worse last year, and always smelled gassy. I have had an intermittently working fuel gauge for a long time, and changed the tank sending unit a while ago, with no improvement. When I had the tank out last week, I decided to run a ground wire to the body, instead of relying on that stupid factory ground strap that counts on the fuel line to frame mounting clips to complete the ground circuit. I soldered a 14 ga. wire to the one of the spring clips that I snipped off the strap and clipped it to the sender outlet. I soldered a ring terminal to the other end and secured it to the shock absorber cross member with a self tapping screw. I know it is not factory, but my gas gauge works now. If anybody is looking up under my old girl's skirts to notice that, they are just too darn close!