2000 Pontiac Montana ran out of gas put 5 gallons of gas in it and it won't start why?

Answer 1

More than likely if you ran out of gas like you said then added gasoline you probably stirred up the junk at the bottom of your tank and the stuff got clogged in your fuel filter,

Try draining the tank and changing the fuel filter, add fresh gas let settle for a while, and try starting the engine

I've run several different fuel injected cars out of gas and had the same problem. What I think happens is that the fuel pump picks up air and the system loses pressurization. What I do now is this: after putting gas in the tank, open your ears and listen carefully. Turn the ignition key to "run" (but do not START). You will hear the fuel pump run for a few seconds then shut off. After you hear the pump stop, turn the key off, and back to RUN again. Again, listen for the fuel pump to run and stop. Do this 3 or 4 times. Now try to start the car.