No I will take my best shot this way. Fuel tanks go bad mostly two ways. from inside out mostly believe it or not? {from experience of many years and many old boats. That wont happen much nowadays with the alchohol ethanol in gasoline. A bad install is what you are talking about and I am covering all bases there. If you foam a tank in place you better take the pains to first etch the aluminum then and only then epoxy coat it. or atleast coaltar epoxy very thick because one scratch will do it in. Then I set the tank on dedicated tank supports that are glassed to stringers and hull. then the tank has dense neoprene pads that are on the bottom of the tank and isolate it from any non aluminum. No wood or glass touches the tank. next the tank is bolted into dense penske board spacers between the main stringers and the tabs welded on to the tank. using stainless bolts.No wood, fiberglass or FOAM !!!!, like a lot of top name builders still use, will trap water up against my aluminum tank. Then the tank if water does ever get to its surface of condensation from filling the tanks on a warm day from ground cooled storage tank fuel . It will end up in the bilge and pumped overboard not trapped next to the aluminum coroding it like a cancer you cant see. Also aluminum of all the metals does not like to be coated or have anything secondary bonded to it. Except the same type aluminum welded to it. I remember 20รท years ago when I saw ocean yachts aluminum stringer molds and asked if they ever got the stringers stuck in the mold? They said nothing ever sticks permantly to aluminum. So epoxy all the tanks you want and then foam them in also if you want. This is my way and also a noted surveyor david pascoe also is in this ball park on my thinking? sorry for the more then one word answer but I take my boat work very serious and I take no prisoners when it comes to bad boat building?