The Operator fueled Vessel 1, then tried to start the motor; Vessel 1 would not start.  The Operator allowed Vessel 1 to sit for a few minutes, then started the generator.  The Operator then opened the hatch to the generator, allowing oxygen to enter the compartment and causing an explosion.  The force of the explosion threw the Operator back into the glass door.\
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Per a summary received from the Fire Investigator regarding this case, it is probable that a leak in the fueling supply network existed prior to the fueling operation and subsequent initiation of the onboard engine/generator.  Vapors that  gathered inside the bilge and engine bay were ignited by a random spark.  Evidence at the water pump indicated that a spark could have occurred, thus igniting gas vapors that were present.  Opening of the hatch cover above the engine/generator supplied additional oxygen to enhance the explosion and flames.
Port Clinton