RedactedNarrative: Vsl #1 was at the gas dock, fueling at Ken's gas dock at 24600 Jefferson, SCS, MI.  Subject started the engines and a large flame came from the engine area and shot into the cabin area starting a fire.  
  
  Subject attempted to put out the fire with an on board fire extinguisher and received help from other people.  SCS fire, EMS and police arrived n scene and rendered aid.  
  
  Subject stated he recently worked on his boat engines and may have not connected the flame/spark arrester.  Subject2 told Subject not to start the boat because the gas cap was not secured.  
  
  Subject started the boat anyways.  No injuries were reported.  Subject refused medical aid.