I had told my brother that for the last 15yrs the 58, after more than a half tank, i would smell gas inside. Couple days ago he pulled the hard top off to unload the rest of the spare parts on top of the convertible top. He pulled the gas tank fiberglass cover off to check things out. He found fuel stains around the fuel sending unit and the rubber filler neck tube. That would be it!. He pulled the tank to clean things up, pulled out the fuel sending unit, gasket was toast. He callef and ask if the tank gauge read accurate, told him it never went past 3/4 tank when full. Sent me a pic of it, i can't believe it worked at all. The tank has been emty for 10yrs, so it might have finished rusting since then. He got the tank cleaned up and boiled out and straps repainted, waiting on new fuel sending unit and fill hose. He also is waiting on new wheel cylinders.