Fueled main tank. Cast off clear of fuel dock. Operator turned igniton key to start engine. Fuel vapors in boat iginted. Dock attendant and vessel operator each used  B/C size 1 fire extinguishers to put out the fire.  Passenger received 1st and 2nd degree burns to her right calf and right elbow and was transported to Kootenai Medical Center for treatment. Operator did not turn on installed exhaust blower before starting engine. Interior starboard aft of vessel and upholstery damaged.
Coeur d'Alene                 