ENGINE COMPARTMENT FIRE WITH VISIBLE FLAMES. DRIVING ON A GRAVEL ROAD APPROXIMATELY 10 MILES PER HOUR. STOPPED TO CHECK OUT THE ROAD CONDITIONS AHEAD AND THERE WAS SMOKE COMING OUT OF THE DRIVERS SIDE FRONT WHEEL WELL. TURNED THE TRUCK OFF. OPENED THE HOOD AND THERE WERE VISIBLE FLAMES BEHIND THE ENGINE NEAR THE FIRE WALL. WE PUT THE FIRE OUT WITH BOTTLED WATER. *TR