[Bob Carriere]

Had a look at the dents you are trying to pull out.

Have you tried soldering a brass bolt or copper tab ??? then use the typical dent puller.

We have had good success at the barn soldering pin holes in tank bottoms... we dimple the pin hole with a small ball pein hammer and clean the area to bare metal
.... we use an electrical soldering iron ......once sanded down they do not even show and do not leak. So soldering should give a very good bond...... to attach a puller to.

You maybe able to pull enough to be able to finish the job by using solder to fill any indentation left... then sand down.

We used an acid solution to clean out the inside and once rinsed and sand blasted on the outside we discovered a lot of pin holes..... then we inserted a 12v bulb inside the tank and closed the barn doors....... there were a whole bunch of shinning little stars which were not seen in daylight.... all were dimpled and soldered. For good measure we used a gas tank sealer on the inside...... a real messy job but worthwhile.

Cheers