RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHILE ATTEMPTING TO START VESSEL 1'S ENGINE AFTER FUELING VESSEL 1. OPERATOR 1 OPENED THE BLOWER AND FLIPPED THE IGNITION AND AN UNKNOWN MECHANICAL FAILURE WITHIN VESSEL CAUSED THE ENGINE COMPARTMENT TO BECOME OVERWHELMED WITH FUEL. THE VAPOR IGNITED CAUSING AN EXPLOSION/FIRE ON VESSEL 1. OPERATOR 1 SUSTAINED INJURIES DUE TO THE FIRE. THERE WAS DAMAGE TO THE ENGINE COMPARTMENT.