ACCELERATING ONTO FREEWAY, NOTICED SMOKE OUT OF BACK OF CAR- PULLED OVER AND FLAMES COMING OUT OF ENGINE. FIRE DEPT. PUT OUT- FIRE MARSHALL INVEST. STARTED- HAD TO CUT BATTERY LINES TO STOP FIRE AND TOOK 45 MIN TO PUT FIRE OUT, GAS SPRAYING THROUGHOUT ENGINE AND FUEL SYSTEM. CAR TOTALLED..