* Fuel Pump: Running completely out of gas can sometimes damage the fuel pump. The pump relies on the fuel to lubricate it. Running dry can cause it to overheat and fail. This is more likely if the car was driven for a significant time on nearly empty fuel.
* Air in the Fuel Lines: When the fuel level gets very low, air can get into the fuel lines. The fuel pump may struggle to push the air through, preventing fuel from reaching the engine.
* Computer Issues: The car's computer might need to re-prime the fuel system after running completely dry.
What to do:
1. Add Gas: This is the most important first step. Add at least 5 gallons of gas. Don't just add a small amount.
2. Wait: After adding gas, wait a few minutes to allow the fuel to reach the pump and lines. Don't crank the engine repeatedly during this waiting period as this could further stress the fuel pump.
3. Try to Start: Attempt to start the car.
4. If it Still Doesn't Start:
* Listen for the Fuel Pump: When you turn the key to the "on" position (but don't start the engine), you should hear a brief humming sound from the fuel pump (it's usually located in the fuel tank). If you don't hear it, the fuel pump might be the problem.
* Have it Towed: If you don't hear the fuel pump or the car still won't start after waiting, it's best to have it towed to a mechanic. Attempting to repeatedly crank the engine with a malfunctioning fuel pump could cause further damage.
* Check the Fuel Pressure (Advanced): If you have the tools and knowledge, you can check the fuel pressure at the fuel rail. Low or no pressure indicates a problem with the fuel pump or lines.
In short: Add a significant amount of gas, wait, and try starting. If it doesn't start, don't keep cranking. Call a tow truck or a mechanic. The longer you try to start it with a faulty fuel pump, the more damage you could cause.
