Not Ranked
if the sole reason behind this query is how to prevent an inferno, then why not just fill the fuel cell with foam...and fill it via a normal (outside) filler tube?
Are you overthinking things?
A gas cap in the boot, no matter how careful you are, will always have gas spilled around it, even if you wipe up after every fillup. The boot will always smell of gas, as will anything you carry in there.
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