We were driving and noticed a few white puffs of smoke. The next thing that happened was a loud bang from the engine and the cab of the truck filled with black smoke. Within 5 minutes, the entire truck was engulfed in flames, as well as our camper. There was no warning indication on the dash. The insurance company had investigators look at the remains. However, since the truck was aluminum and the fuel filter housing and low pressure side of the fuel system was plastic, everything totally melted. The truck was properly serviced prior to our travels.