RedactedNarrative: VESSEL 1 WAS LAUNCHING AT PORUM LANDING BOAT RAMP.  OPERATOR HAD JUST FILLED THE VESSEL WITH FUEL AT A LOCAL GAS STATION.  OPERATOR DID NOT PROPERLY VENT THE MOTOR COMPARTMENT BEFORE ATTEMPTING TO  START THE MOTOR.  WHEN OPERATOR ATTEMPTED TO START THE ENGINE, FUEL FUMES IGNITED.  THE FIRE IMMEDIATELY CONSUMED THE ENGINE COMPARTMENT AND EVENTUALLY THE ENTIRE BOAT.  ONCE THE BOAT WAS ENGULFED IN FLAMES, THE OPERATOR JUMPED OVERBOARD.  OPERATOR RECEIVED BURNS ON BOTH LEGS FROM HIS KNEES TO HIS FEET.  DRIVER OF THE TOWING TRUCK TOWING THE VESSEL PULLED AWAY FROM THE BOAT ALLOWING VESSEL 1 TO FLOAT FREELY AWAY FROM THE BOAT RAMP.  VESSEL 1 BURNED TO THE WATER LINE AND WAS A TOTAL LOSS.