* Faulty Gas Cap: A loose, damaged, or improperly seated gas cap can prevent the fuel tank from properly venting. This creates a vacuum, preventing fuel from entering. Try tightening the gas cap securely. If it's damaged, replace it.
* Clogged Fuel Tank Vent Line: The vent line allows air to escape the tank as fuel enters. If this line is clogged with debris or ice (in very cold weather), it can create a vacuum and prevent filling.
* Faulty Fuel Pump: While less likely to completely prevent filling, a weak fuel pump could struggle to create the necessary pressure to overcome a slightly restricted vent. This would result in slow filling or filling stopping prematurely.
* Issues with the Fuel Filler Neck: There could be a blockage or problem within the filler neck itself, preventing the nozzle from seating correctly or the fuel from flowing freely.
* Incorrect Fuel Nozzle: In rare cases, the fuel nozzle might not be compatible with your vehicle's filler neck. This is less likely, but possible.
* Other Obstructions: Something could be lodged in the filler neck, preventing the flow of fuel.
What to do:
1. Check the Gas Cap: This is the easiest and most common cause. Tighten it securely and try filling again.
2. Listen for gurgling/hissing sounds: While filling, listen carefully for unusual noises. Gurgling or hissing might indicate a venting problem.
3. Try a different gas station: While unlikely, it's possible there's a problem with the pump at that particular gas station.
4. Check the filler neck: Carefully inspect the filler neck for any visible obstructions.
If none of these steps work, you'll need to have your vehicle inspected by a mechanic. They can diagnose the problem more accurately and perform the necessary repairs. Continuing to try to force fuel into the tank could cause further damage.
