RedactedNarrative: On June 4, at approximately 15:59 hours, subject was working on the engine of his inboard ski boat while his boat was tied to his dock.  He had removed the engine cowling and had adjusted the timing belt.  Subject attempted to start his boat by turning the key and advancing the throttle.   The boat started and immediately the engine caught fire.He advised me that the ignition switch did not sound right as he turned the key.  The fire caught the fuel line on fire rapidly spreading the fire.  