How does Iron Man Maintain his fuel and never run out?

Question

How does Iron Man Maintain his fuel and never run out but his suit doesnt have a place to store the fuel?

Answer 1

Its all smoke and mirrors.

Answer 2

It's a movie!

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Answer 3

In the movie, he invents a an extremely small yet high-energy reactor.  It's the glowing object in the center of his chest.  It is a fictional devices.

Answer 4

doesn't need fuel, because it's a movie. things never run out in movies. that's the great thing about movies