It really depends on your circumstances. Can vapors build up to ignition levels? Sure, if you've got a well sealed, small space, and you let it leak long enough...
Your average pole barn has enough volume and airflow that it would be virtually impossible for the vapors to build up enough to ignite or explode changing the average leaky fuel tank.
You'd really have to be trying hard to get any sort of fire, such as having the heater mere inches away from the leaky gas tank showering hot sparks.
The main risk is with the tank itself. Drained of liquid fuel it could feasibly contain an explosive air/fuel mixture, and a wayward spark falling in just the right place could ignite it. If you use the torpedo heater I would recommend shutting it off before you pull the sending unit out, and not turning it back on until after the tank has been tossed out on the scrap pile.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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