RedactedNarrative: Vessel A had just finished fueling the vessel at a community gas pump, operator stated that the engine blower was on the entire time during fueling and up until the explosion.  Operator of Vessel A started the engine and began to motor away from the gas pump and heard a little explosion in the engine compartment and started burning.  Both occupants departed the vessel due to the fire and were picked up by other boaters.  The vessel burned to the water line.