While driving on an interstate the engine lost power and I pulled over to the shoulder. Popped the hood and the engine cover was blown back and the engine was on fire! Had 3 passengers, dog, and luggage in the car. Was able to get most out before the fire spread. Left family stranded hours from home on side of interstate. Unsure of exact cause of the engine fire. Fire spread to entire car before fire department came to put it out.