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Corosion is generally - not always, but generally - worse in a gas tank. Fuels float, so any water collects at the bottom of a tank, and that is where they rust through from the inside to the outside. We have a 300 gal gas tank here that is older than me, still using it. just watch the bottom. If you see a slight damp spot while it is full, do NOT pick at it, get the tank emptied!!!!! Any picking will open up a rust bubble & cause you all sorts of grief with the EPA. Flushing them out is time consuming & messy, but pretty straightforward. You didn't ask so I won't go into it, but you should filter it, water trap it, and be concerned about where you place it. Your state will have restrictions on how far from a house, building, well, wetlands, tile intake, and the like. There probably in no containment structure required, but that will be coming in the next decade, and your insurance co might mandate some of this stuff as well. Us oldtimers are generally grandfathered in on a lot of the above & leave well enough alone, but if I were starting a new fuel storage area, I'd think about some of that EPA stuff & a containment deal. --->Paul
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