RedactedNarrative: I responded to the dinner key anchorage in ref to a boat fire on the above listed dated and time. Upon arriving, city of miami a-shift fire boat had already extinguished the fire. I then went to the marina office where i contacted the vessel's owner. 
  Operator stated that at approximately 0630 he anchored the vessel and was beginning to shut off all engine systems. While preparing to shut off the battery banks he said he noticed the smell of fuel in the room. He shut off the first bank and went to investigate the odor. He checked around the engine and noticed smoke emanating from behind the engine. He returned to the banks, shut off the remaining banks and picked up his fire extinguisher. At that point the smoke became overwhelming and he excited the vessel. Operators entered his tender then began to row away and contact coast guard. Shortly afterward he saw flames erupting from within the cabin and begin to reach the deck. 
  City of miami fd investigatorwas contacted and will be conducting the investigation. Exhaust manifold leak caused overheat and ignition of fuel vapor