RedactedNarrative: The boat operator had just finished fueling the boat at the marina. The operator said that she left the dock and drove through the Colvill Park no wake zone. After exiting the no wake zone, the operator stopped the boat and turned off the engine so they could place a tube in the water to pull the kids behind the boat. The operator said she then started the boat motor and heard a loud bang and observed white smoke and then black smoke coming from the engine compartment. 
  
  The operator said the boat engine was equipped with a halon extinguisher system which put out the fire. She then called 911 and anchored the boat to keep it from drifting. The County Sheriff's Office responded to the scene and assisted with towing the boat to the boat launch. The operator said the boat does have a blower for ventilation of the engine compartment but she did not turn it on after fueling or prior to restarting the engine on the river. A possible cause of the fire and explosion in the engine compartment was a build up of gasoline fumes. There were no injuries, and life jackets were being worn by all on board.