The contact owns a 2008 Hummer H3. The contact stated that upon shifting into drive (D) or reverse (R) the doors of the vehicle would unlock automatically. There was no warning light illuminated. The contact also stated that upon pressing the power master door lock switch to lock the vehicle, all four doors were unlocked. Additionally, the contact stated after refilling the gas tank at the gas station, the vehicle failed to restart and made an abnormal clicking sound. The contact stated that upon inspecting the hood of the vehicle, he saw flames on the positive side of the battery and the flames extended to the oil stick. The contact was able to extinguish the fire by taping it with a towel. The vehicle failed to start and remained at the gas station. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 132,000.