I had really three choice as where to put my gas tank in my '31 Ford - well actually four if you want to consider the original style '30-'31 Ford, and with 10 gallons sitting right over your lap. Trunk, inside of the splash shields or modify the frame to accept the '32 style tank and my choice. I figured in the event of a rear end collision, I would be better off with that fuel behind me, at least giving me a chance to get out. As far as a trunk mounted tank - not much room in a '31 and have any useable space. I really dislike the polyethylene side tanks - think scrub line - and they are actually below that imaginary line.

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The wiring mess has since been corrected, but this will give you an idea of the lack of room