You can also opt to add more foam or replace the OEM foam with something thicker, lifting the tank a little higher above the rivet. If the rivet has already made a hole in the tank, this is an easy leak to fix. Auto parts stores sell a two-part epoxy especially designed for sealing fuel tanks. Or, braze the hole shut. While the tank is out, there are several other things that definitely should be done.
Top priority is to clean the outside bottom of the tank and apply rustproofing.
Other good ideas include replacing all of the hoses if they're more than ten years old or so, upgrading the fuel filler , and coating the inside of the fuel tank, surge tank, and vapor separator with Bill Hirsch Fuel Tank Sealer. All rights reserved. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England.