This falls under the category of YMMV, but if you know about engines you know
that gasoline vapors and oxygen will only combust when they are close the the
proper mixture of one to the other. (Which of course is why carburetor tuning
is so critical to an engine's performance.) So too much oxygen or not enough
oxygen, and no combustion. That's not to say that you won't be the lucky
person whose tank hits the mixture just right.
> I will not recommend this, but many years ago I have seen "old masters" weld
> gas tanks with an exhaust hose inserted into the tank from a running engine.
> The exhaust forced the gas fumes out of the tank. Really. DON'T TRY IT
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