RedactedNarrative: A vessel with seven total occupants was heading southbound on the Intracoastal Waterway near Jupiter, Florida.  While underway, the operator was having mechanical issues and slowed down to assess the problem.  When operator attempted to get back on plane to move to a safer location, a loud “pop” noise came from the engine compartment.  Occupants observed flames coming from the compartment and abandoned the vessel.  Good Samaritan's rescued the occupants and transported them to the nearest sandbar.   The vessel was engulfed in flames and sustained extensive damage.
  Conclusion:  Due to the vessels excessive damage and condition, the cause of the fire is not able to be determined.  It was reported that the origin of the fire began in the engine compartment of the vessel.  Improper ventilation after refueling or electrical malfunctions could not be positively identified or denied during the investigation.  The vessel was removed from the water with the use of a forklift and transported away by a flatbed tow truck.  All occupants involved did not receive medical care beyond first aid from EMS and denied medical transport at 1615 hours.;