I have been working to stop a slow drip leak from near my fuel sending unit, stock 76 280z. When I fill the tank above about 3/4, I get a slow drip from that area.  It is hard to tell if it is the o ring or the elec. connectors, or maybe a hole in the top of the tank? I have installed the new o ring, and also a new locking nut.  I also put some JB waterweld around the electrical connectors on the outside (I didn't want the chance of putting anything on the inside in case it fell off in