Whoa!

Do NOT take any fuel on board an airplane in checked luggage or otherwise.

In fact, let me know what flight you were going to be on so I can stay away.

I'm a pilot and I'd have you tossed off the flight in an instant, TSA or no.

At altitude, in an unpressurized or low-pressure cargo hold, there's a good chance the fuel would leak out. One spark, and BOOM.

Please don't even think about doing it. Buy fuel at your destination.