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Is the gas smell from the engine compartment or the tail pipe and how strong is it? About the only sensor that can cause a no start condition is the crankshaft sensor. (The ECM can substitute workable values for most of the other sensors.)
If the smell is from the tail pipe mostly, perhaps an injector has stuck and flooded the engine. Holding the throttle wide open may help in that case.
If the smell is from the engine compartment, find the leak and fix it before trying other stuff before you have a fire!
Good luck and keep us posted.
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