RedactedNarrative: Vessel departed beach in triangle area when operator and passenger stated they heard a loud pop in the engine compartment area and then noticed smoke and flames coming from engine compartment, side vents and vent located near cabin area entrance.  Operator stated that ventilation system was in operation at the time they heard the popping noise and saw the flames and that there was a slight odor of gasoline prior to the popping.  Passengers donned life jackets and jumped off the vessel.  Operator opened engine compartment and stated that a passerby on a jet ski attempted to spray water on the engine compartment.  Operator used fire extinguisher to put out fire and then jumped off the vessel. Passenger one stated that she injured her foot while exiting the vessel but she refused treatment at the scene.  All passengers, operator and vessel were taken to oak ridge boat ramp. Area of accident was approx 710 feet east of the east edge of us hwy 69 northbound and approx 1920 feet south of the north edge of us hwy 69 bridge and approx 1946 feet nw of the oak ridge boat ramp.