* Fuel Pump Issues: The most likely culprit. When the fuel tank is completely empty, the fuel pump can overheat and get damaged. This is especially true in older vehicles. The pump needs the fuel to cool it. Running it dry can burn it out.
* Air in the Fuel Lines: Running out of gas can introduce air into the fuel lines. The fuel pump needs to purge this air before it can deliver fuel to the engine. It might take some time, or several attempts at cranking the engine to clear this.
* Clogged Fuel Filter: While unrelated to running out of gas directly, the low fuel situation might have dislodged debris and clogged the filter. This would prevent fuel from reaching the engine.
* Distributor (if applicable): Older vehicles sometimes have distributors. If yours does, a complete lack of fuel might have affected it.
* Other Electrical Problems (Less Likely): While less probable, a coincidental electrical issue could be preventing the car from starting, unrelated to the fuel situation.
What to do:
1. Give it Time: Let the car sit for at least 30 minutes to an hour. This allows time for the fuel pump to potentially prime the system (and cool down if it's overheated). Try starting it again.
2. Check the Fuel Pump (Advanced): This is difficult without some mechanical knowledge. You might hear the fuel pump whine when you turn the key to the "on" position (before cranking). If you hear nothing, the fuel pump is a strong suspect.
3. Check the Fuel Filter (Intermediate): If you have some mechanical experience, locating and checking the fuel filter (and possibly replacing it) is a good step.
4. Have it Towed: If after waiting and checking easily accessible points, it still doesn't start, towing it to a mechanic is the safest bet. They have the tools and experience to diagnose the issue accurately. Trying to repeatedly crank the engine with a damaged fuel pump could cause further damage.
Important Note: Avoid repeatedly cranking the engine for extended periods if it doesn't start. This can drain the battery and further stress a potentially damaged fuel pump. Short cranks (2-3 seconds) with pauses in between are better.
