Turn the key to full power (but do not crank the engine). You may hear a high pitched whine from behind you - that's the fuel pump running. Leave the key on for about five seconds, then turn it off for a minute. Turn the key on again for another five seconds, and off for a minute. Then turn the key on for five seconds, and then crank the engine.
If your car ran out of gas, you need to run the fuel pump this way to get fuel up to the engine again - all the lines from the tank to the engine are empty, so the pump needs to run to fill them.
If this doesn't work, it's possible that the fuel pump is vapor-locked and will have to be replaced. Some cars are more susceptible than others to this type of failure.
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