The contact owns a 2023 Kia K5. The contact stated that while driving at an undisclosed speed, there was a fuel odor inside the vehicle. Occasionally, the low fuel warning light was illuminated. While attempting to refuel the vehicle, gasoline was not entering the fuel tank as intended. The fuel odor inside the vehicle grew stronger. The failure was persistent. The vehicle was taken to the dealer, where the contact was informed that the failure was severe. The contact was informed that, due to the severity of the failure, the vehicle could not be released to the contact. The contact was informed that the fuel tank had expanded severely and that the expanded fuel tank had shifted the frame of the vehicle. The contact was provided with a loaner vehicle. The contact stated that the contact's [XXX] son had been complaining about headaches for several months. In addition, the contact stated that the contact's son's normal seating space was the rear seat. The contact's son was receiving continued treatment from a neurologist for the unexplained, consistent headaches. In addition, the contact was being treated by primary care for unexplained headaches and other illnesses. The contact received notification of NHTSA Campaign Number: 25V794000 (Fuel System, Gasoline). The manufacturer was made aware of the failure, and a case was filed. The contact was informed that the request for a buy-back was required. The contact was informed that the vehicle would not be released due to the safe