Fuel filling problems

Vent valve faulty trapping air in tank.

Where is that and can I bypass it or do I have to replace it? I am driving thirteen hours today to fix it for him and not sure if we can get the part.

Tried to get a picture, but KIA provides no information. But valve will be one of two places either on top of tank or in a hose that goes from tank along filler tube.

Can I bypass it whein I find it?

Yes, maybe able to clean vapor and moisture build a gunk up valve if not replace with a hose do not plug needs to allow air to escape as fuel goes in.

I will give it a try thanks.

Good Luck on trip. This may sound flaky but if vale cannot be found slide a quarter tube down filler neck to expel air.

Great idea!

My daughter has an 2002 Optima that had the same problem. Ran several hours of troubleshooting including removing and checking the canister, which was fine. I finally found a one way check valve that was installed backwards (at the factory). As soon as I disconnected the valve, the pressure instantly released. We reversed it and the car took fuel normally. The valve has the flow arrow molded on it. It should point toward the fill cap, not to the tank.