RedactedNarrative: On August 8, 2015 at approximately 6:15pm I Officer and Investigator of the Florida Fish and Wildlife Conservation Commission responded to a vessel fire while on land patrol in Jupiter FL. The VESSEL (V01: FDC / 1979 / 26 F / BLUE / FL8950DA ) exploded behind the restaurant Guanabanas with four occupants on board. The operator was injured with minor burn the lower portion of his body. The other three occupants were uninjured. The vessel was contacted to remove the vessel and was placed on a trailer on August 9, 2015. Report was taken from operator and currently waiting on Fire Rescue Investigator to complete his investigation. 
  
  They stated that they went fishing that morning, and at approximately 1330 hrs. they came inshore to the restaurant to eat lunch at Guanabanas. They were at the restaurant for about an hour and a half. As they were departing the restaurant dock, as soon as he fired up the engine, it exploded. Operator stated he was the only one injured. At the conclusion of speaking with Operator and his girlfriend I gave my card with my contact information and the case number. We then went to the scene of the vessel fire, behind Guanabana's Restaurant. On scene was LT of FWC and Palm Beach County Arson investigator \. The boat was located in the canal/cut behind Guanabanas restaurant. The boat was already on the opposite side of the restaurant and anchored up when we arrived. I took several photos of the vessel and spoke with Palm Beach County Fire investigator in reference to possible causes. We both came to the conclusion that the operator likely did not run the vent blower before starting the motor resulting in ignition of the trapped fumes. We then went to the Best Western to locate the other two occupants.  They both provided sworn written statements that were consistent with Operator' verbal testimony and with the seating arrangements on board the vessel at the time of the explosion.