* Fuel Pump Damage: The fuel pump is usually submerged in the gas tank and relies on the fuel itself for cooling. Running out of gas can cause the pump to overheat and burn out, especially on older vehicles. This is a very common cause.
* Air in the Fuel Lines: When the fuel level gets very low, air can get sucked into the fuel lines. This air needs to be purged from the system before the engine can run properly. The fuel pump may struggle to push the air out. Sometimes, just letting the engine sit for a while with the ignition on (but not cranking) can help. The fuel pump should push the air out, eventually, depending on the damage.
* Clogged Fuel Filter: Running out of gas can dislodge sediment or debris in the tank, clogging the fuel filter. A clogged filter prevents fuel from reaching the engine.
* Crankshaft Position Sensor (CKP) Issues (Less Likely): While less directly related, running out of gas can sometimes stress other components. A CKP sensor failure can prevent the engine from starting. However, this is less likely than fuel-system-related issues.
* Other Electrical Issues (Less Likely): A completely drained battery, though less likely if you only ran out of gas, could also play a role. The attempt to start may have weakened the battery.
What to Try:
1. Wait: Give the fuel pump some time to clear any air from the lines. Turn the ignition key to the "on" position (don't crank the engine) for a few minutes, then try starting. Repeat a couple of times.
2. Check the Fuel Filter: If you're mechanically inclined, access the fuel filter (check your owner's manual for location) and examine it. If it's visibly clogged, replace it.
3. Listen for the Fuel Pump: When you turn the ignition key to the "on" position, you should hear a brief humming sound from the fuel pump (located usually in the tank). If you don't hear it, the fuel pump is likely the culprit. This requires professional assistance.
If none of the above works, it's highly recommended to have a mechanic check your vehicle. They can diagnose the problem accurately and avoid further damage. A faulty fuel pump is the most likely scenario given the circumstances.
