RedactedNarrative: Vessel 1's carburetor was removed days before the incident to get a part number.  Operator of vessel 1 assumed the carburetor was reinstalled but it was not.  When operator of vessel 1 went to start the vessel without the carburetor or backfire flame arrestor on the engine the vessel caught fire.  Operator of vessel 1 stated the engine cover flew ten feet in the air when the explosion occurred.  Operator left the vessel to get help.
  Vessel 2 docked to the starboard of vessel 1 sustained major damage from the fire.
  
  Vessel 3 docked behind vessel 1 sustained minor damage.
  Dock was destroyed in the incident.