Quote:
Originally Posted by Texel
If the rust has started from the outside (salt etc) rather than inside.
Tank out, paint strip the bottom, coat any rust with phosphoric acid (eats rust at 10x the rate of steel), leave overnight.
Wire brush the now soft rust residue, look for holes or depressions that will turn into a hole.
Wash out tank with water, run water through it for a few hours.
Connect up car tail pipe with hose and run carbon monoxide through the tank when doing the next step.
Using conventional brazing rod, fill all holes etc.
Go to Wurth store, get various rattle cans of primer, thick underside sealant etc, they have a wide range and you can get a good match on the original with a bit of experimenting.
The bit below is more for viewers than the original poster as I can see this thread going pear shaped......
If you are of a timid dispensation and the throught of welding on a gas tank is a bit scary then don't do it.
If on the other hand you have a peek down the front of your undershorts and you can find a set of stones, crack on!!!!
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That last line got me. Nicely played.
the easy way is with Kreem inside and JB Weld outside. Beware though, its never just one pinhole...