I picked myself up a gasoline fueled blow torch a short while back. This one is made by the Lenk Manufacturing Company. The soldering iron on top is an old one I had gotten quite a long while back.

This blow torch takes a quart of gasoline, but I don't really fill it up that much, since it doesn't pump properly.

I pump the thing about 15 times before unscrewing a little screw on top of the burner head right behind the soldering iron hook, this screw opens up some and a trickle of gasoline dribbles out and into a dish under the burner head.
This little dish is the preheating dish which you light with a match or lighter and while that little pool of fuel burns it heats the torch head.

Once the fuel burns off and the torch head is sufficiently heated to vaporize gasoline one can then give it 30 more pumps to give it sufficient pressure and turn the needle valve knob to adjust the torch.

It burns quite hot and it's actually rather cheap. 2 gallons of gasoline will last me a good while. I can use it for quite a few things, but I can't braze with it. I think if I got another torch I could probably braze small to medium sized copper parts if I held it up into the two cones of flame or maybe even dual wielded it.

On this torch is a wind screen I made for it so a breeze doesn't just blow the flame away from heating the torch head.