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Boasun, steam gennies may be common in cow country but in the Northeast US you'd have an easier time trying to rent wooden false teeth.
Ajay, an empty tank is now full of vapors and vapors are more explosive than liquid fuel. One trick to making that safer is to dump crushed dry ice into the tank, as the CO2 "melts" it will displace the air and fill the tank with CO2 which doesn't support combustion. You could use CO2, nitrogen, or any inert gas from a welding supply to do the same thing as well. It may be simpler and safer to just remove the tank, clean it out beforehand and afterwards where there's space to work.
The big trick is going to be making sure there are no metal particles of filings in the tank. Putting thick grease on the tool eldge will help that. If you can squeeze in a helper with a vaccum, that also helps. Either way you'll want to wipe out the tank afterwards and really try to chase out those cuttings.