On [XXX], I was driving westbound on [XXX], between Kerrville and Junction, Texas. I noticed a diesel fuel smell and pulled off the highway to investigate the source. Upon stopping, fire erupted from the engine compartment and quickly spread to the front dashboard and front passenger seating area. No warning lamps, no high temp or abnormal gage levels. The Mountain Home, TX volunteer fire dept arrived about 30 minutes after we called 911 and extinguished the remaining flames. They commented that a cracked / failed secondary fuel filter housing could be to blame. My insurer, State Farm, under claim #[XXX], now has possession of the vehicle remains. I told State Farm that NHTSA opened an investigation into possible fuel filter housing failures / fires. I do not know what their intentions are with the vehicle remains. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)