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You can build it out of almost anything you like but fuel tanks are an area where the boat owner should be very careful. It isn't just a case of making a mess, like a holding tank, or running out of water in the case of a water tank, or sinking the boat should you run a hose incorrectly.
Fuel has fire and enviromental issues that no one wants to risk as it could take out a whole marina and not even give the crew a chance to escape.
Aluminum is preferred for fuel by many because it is often stronger than plastic.
Plastic is preferred by many because it can be cheaper.
Stainless can be the best choice of all but because it is heavy and expensive most people try to use the thin stuff.
I believe that there is a USCG restriction if using stainless for a gasoline tank. No larger than 20 gallons and it has to be cylindrical with domed ends. No such restrictions on size for diesel tanks. Maybe that is a ABYC standard?
So ask if that is the problem. You can also ask for thicker metal and better, stronger design but that cost dollars.
Have faith that the oceans are going to rise and flood the world, that plague and pestilence brought on by Climate Change is going to punish us for not believing. Please do as they say it is our only hope. :P
Last edited by Architeuthis; 02-16-2010 at 10:55 AM.