Engine caught on fire while driving down the hhighway in SC. Vehicle was towed to Fred Anderson KIA of Greer & has since been sold by them after sitting in their lot for almost 3 years. I was driving down the highway not knowing my car was on fire. I only pulled off at the exit because my son, who was in the car behind me, had called to tell me he needed to use the facilities at the next exit. I pulled up to a gas pump to top off my gas tank while we were there. It was not until then that I had smoke coming out from under the hood of my car. I opened the hood and the engine compartment was completely engulfed in flames. The fire department did come onsite to extinguish the fire but a bystander had already used an extinguisher and put it out. Insurance refused to pay due to the many issues with KIA vehicles and had reduced my insurance to only liability. There were no prior warnings of any issues with the car. We had been driving all night from Ohio to SC for a family wedding and we were still 3 hours away from our destination.