Ran out of gas in your 2001 Chevy Cavalier put gas in it and now it wont start?

The reason is: When you completely run out of gas your gas lines are completely drained of fuel. When you refuel the car the fuel lines are still empty, and you will need to crank the car until the fuel pump has filled the gas lines and established the correct fuel pressure. it's possible you burnt up the fuel pump running it with no gas.