MY SON WAS DRIVING THE TRUCK WITH MY OLDER SON ALSO IN THE CAB. MY SON THAT WAS DRIVING NOTICED THAT THE TRUCK WAS LOSING SPEED AND THAT NOTHING WAS HAPPENING WHEN HE PUSHED ON THE ACCELERATOR. HE PUT THE TRUCK IN PARK AND SMOKE BEGAN FILLING THE CAB. THEY GOT OUT OF THE TRUCK IN A HURRY AND RAN. THE TRUCK EXPLODED 3 SECONDS LATER AND BURNED COMPLETELY. WE ARE NOT CERTAIN WHAT CAUSED THE FIRE, BUT IT APPEARS TO BE THE FUELING SYSTEM