RedactedNarrative: UNIT 1 WAS MOORED IN THE DOWNTOWN MOORING FIELD IN BEAUFORT RIVER.  THE OWNER WAS TRANSFERRING FUEL FROM HIS TENDER FUEL TANK INTO ANOTHER TANK IN ORDER TO DILUTE THE FUEL/OIL MIXTURE.  THE FUEL/VAPOR IGNITED DUE TO POSSIBLE STATIC ELECTRICITY.  THE TANK WAS THROWN OVERBOARD.  THE OWNER AND PASSENGER SUSTAINED BURNS TO LOWER LEGS.