What Fuel Does a Real Luke like Engine Use?

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Thanks Anc but that confuses me even more as that example does use fuel as it is hooked up to a compressor supplying a continuous pressure and fueled by electricity.

Chrisjo, More confusion (which isn't that hard for me) and against what I have come to understand of the principles of water and liquids. The properties of water can't be compressed so the steam under pressure is what escapes a cars radiator and because of the force of the escaping steam it brings up water with it. I can't see how water can re-reach its boiling temperature by releasing the steams pressure above it without something creating the temp to rise..i.e. heat. I guess to put it in simpler terms for my mind, I can't see how water that no longer has a heat source and is gradually cooling, can create heat to bring it to a boil temperature again. I should have paid more attention in science class.