I just tried a new method to clean rusty and dirty gas tanks:
1. Take your concrete mixer or go to your friend (as I did) and
take his.
2. Fit the tank to the drum of the concrete mixer.
3. Take a piece of toughened safety glass (not laminated!) and
crack it. Use a cheap or free car screen, not one from a
Mercedes Gullwing or so.
4. Fill the shatters of the toughened glass into the gas tank and
let the tank turn round and round for some hours on the concrete
mixer.
5. Clean the tank with a vacuum cleaner (take your workshop vac,
not your wife's household vac!)
6. Rinse the tank.
7. Use it as it is or seal it with a good tank sealer.
The glas cleans the inner surface of the tank to the pure metal.
You don't need any dangerous liquids and an old sheet of toughened
glass is cheap or free.
Try it! I've cleaned the two tanks of my Kettenkrad in this way.
Regards from Germany
Andreas
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