RedactedNarrative: Unit 1 docked at the Harborgate Marina facing south on the ICW in order to fuel the boat.  Unit 1 operator reports that upon completion of fueling the boat he started the engine and then heard an explosion at the rear of the boat and saw fire.  One person sustained injuries to his head after being blown in the air and landing on the dock.  Two others sustained burns to their legs after falling and landing on the engines.