RedactedNarrative: SUBJECTS FUELED UP VESSEL AT LAKE LURE MARINA, PROCEEDED THROUGH NO WAKE ZONE AND BEGAN TO ACCELERATE, EXPLOSION OCCURED, BLOWING OUT CUP HOLDERS, DASH PANELS AND SPEAKERS AS WELL  AS SEPERATING HULL DOWN THE STARBOARD SIDE OF VESSEL. FIRE EXTINGUISHERS WERE USED TO EXTINGUISH FIRE. OPERATOR ADVISED THEY HAD CUT ON SWITCH TO PURGE ENGINE COMPARTMENT AFTER FUELING. IT IS MY OPINION THAT THE ENGINE COMPARTMENT FAILED TO PURGE FUMES CAUSING THE FIRE. NO ALCOHOL OR DRUGS WERE INVOLVED.