* Fuel Pump Issues: Running out of gas can sometimes damage the fuel pump. It might have gotten airlocked, or the low fuel level may have caused it to overheat and fail.
* Air in the Fuel Lines: Even if the pump is okay, air getting into the fuel lines is common after running completely out of gas. The engine needs fuel pressure to run.
* Low Fuel Pressure: The fuel pump may not be delivering enough pressure, even if it's running.
* Crank Sensor: Though less likely directly related to running out of gas, a faulty crank sensor will prevent the engine from starting even if it cranks.
What you should do:
1. Add Gas: Obviously, add enough gas to the tank. Several gallons are recommended to ensure the fuel pump is properly submerged.
2. Wait: After adding gas, give the fuel pump a few minutes to prime the system and build up pressure. Try cranking again.
3. Listen for the Fuel Pump: Before cranking, turn the ignition key to the "ON" position (without cranking). You should hear a brief humming sound from the fuel pump. If you don't hear this sound, the fuel pump may be faulty.
4. Check the Fuel Filter: A clogged fuel filter could also prevent fuel from reaching the engine. This is less likely directly caused by running out of gas, but it's worth considering.
5. Professional Help: If none of the above works, it's time to take it to a mechanic. There could be a more serious issue, and attempting further troubleshooting could potentially damage the vehicle.
Important Note: Repeated cranking without successful starting can drain the battery. If you have trouble after several attempts, consider jump-starting the car.
