RedactedNarrative: The owner of the vessel stated that he left the marina after fueling his vessel.  Shortly after leaving the marina his engine backfired. After the backfire he noticed flames coming from the engine compartment.  At that time he tried to extinguish the fire with his fire extinguisher to no avail.  Unable to extinguish the fire he and his wife went overboard into the water for safty.  They were picked up by two PWC and transported to the Wharf Marina.  Orange Beach Fire Department arrived on scene.  The Orange Beach Fire Department advised that the fire was caused by a faulty fuel line that had a leak and the ventilation system was not ventilating properly.