My car was low on gas, started but then died. We put gas in, but the car won't start now. What is wrong?

Sounds like your fuel pump has retired on you,running you car low on gas is hard on pump,they are cooled by the gas an are lubercated by the gas, I hope this helps you

Here's a couple of things to check out...
1. If the car is on an incline at all, move it to level ground and try starting.
2. Test for fuel pump actuation
Remove the gas cap. Listening very carefully with your head out the door and getting as close to the ground and listening at the gas tank.Turn the ignition switch to the ON position ONLY, Do NOT try and start the engine. You should be able to hear the electric fuel pump motor run for only 2 seconds and then it will stop. If you can hear it run for the 2 seconds and then stop, You do NOT have a fuel pump problem. If you do NOT hear the fuel pump run for the 2 seconds and stop then the fuel pump, is not working. It may be the relay or pump.
3. Check fuel pump relay to ensure it is ok. It's located in fuse panel under dash driver's side. Note: it probably has a support bar over it.
4. Fuel filter may have been plugged by picking up "gunk" from low fuel condition. Change fuel filter, located under car on the frame rail near the gas tank.