all three of those ways are a good way to eliminate your gas tank problem, your boat problem, and any heath issues you have, if you are heavily insured, your wife will appreciate the effort.
Seriously, don't do any of those ways, they are very dangerous. First off, is there any gas in the tanks? If there is, pump all the gas out. With saddle tanks, it may be easier to remove them and give them a good washing out with degreaser and water. You need to replace the fuel fill lines, vent lines and fuel lines any way aren't you? If there is any gas in the tanks, you need to properly dispose of it. IF you want to check the tanks for leaks, add a different food coloring to each tank(you can tell which tank is leaking), When you fill them up start with a 1/4, then half full, then 3/4. That way if one tank leaks, you can transfer it to the other tank, and you can tell where the leak is(near the bottom if it start leaking right away , half way up the tank if it start on teh next fill, and so on). If it only leaks when you have it all the way full, odds are its at a weld joint for the fuel lines, or the fuel sender. Best way to clean your tanks is to put some E15 or E85 gas in it, then tow it around to slosh it all around the tank, nothing will clean out a tank better than ethanol. Pump the tank out and dispose of teh gas.
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