The contact's sister owns a 2014 Kia Optima. The contact stated that while the vehicle was parked unattended, it spontaneously caught fire. The ABS warning indicator light had previously been turned on and off. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. A police report was filed. The fire department was able to extinguish the fire. There were no reported injuries, crashes, or air bag deployments. The contact stated that the failure was related to NHTSA Campaign Number: 20V100000 ( Fuel System, Gasoline). The failure mileage was approximately 85,000.