RedactedNarrative: On 08/07/2016 at approximately 0855 hours,  Operator1 took his wife Passenger1, daughter Passenger2, niece Passenger3 and their two dogs out for a boat ride aboard his 19' Searay Cuddy Cabin.  Operator1 had dropped the boat at the 10 Lane boat ramp at Lake Pleasant.  After putting the boat in the water, Operator1 said he turned on his blower motor while they were loading stuff onto the boat.  After everything was placed onto the boat, Operator1 said the boat was started and he let it idle for a little bit before heading out.  He said there was nothing unusual with the boat at this time.  Operator1 said they idled north away from the 10 lane through the no wake zone.  He stated after passing the No Wake Buoy, he accelerated the boat and there was an explosion in the engine compartment.  The explosion blew the engine cover off and sent a flame approximately 10' into the air.  Passenger2 and Passenger3 were sitting in the back of the boat when the explosion happened. Passenger3 was seated behind Operator1 and Passenger2 was seated behind Passenger1.  Operator1 told me he grabbed both girls and pulled them to the front of the boat and then grabbed the 2 dogs and threw them into the lake.  Passenger1 was in the middle of the boat and away from the explosion.  Operator1 stated he then grabbed his fire extinguisher and tried to put out the fire.  While using the spraying the fire, Operator1 stated the extinguisher malfunctioned, but the fire was out.  During his effort to put out the fire, Passenger1, Passenger2 and Passenger3 all jumped into the lake.  Operator1 added that some time while putting out the fire, he burned his left hand on the finger tips.  
  
  After the fire was out, Operator1 and a couple on a nearby pontoon boat helped the girls, Passenger1 and the dogs out of the water.  Everyone was put aboard the pontoon boat and Operator1''s boat was towed back to the 10 lane ramp.  Peoria Rescue 199 arrived a few minutes later and began treating Passenger3 and Passenger2. It was estimated that Passenger3 had burns over 15% of her body.  Most of the burns were on her back and arms.  Passenger2 had approximately 5% over her body burns and they were on her back and arms.  Based on the amount of burns, Peoria Fire had Passenger3 flown to the Maricopa County Medical Center Burn Unit.  Passenger2 was also taken to the MCMC Burn Unit, but by ground ambulance.
  
  While the girls were being treated, Operator1 was at the boat checking on his wife and the dogs.  He was asked if there had been any issues with the boat prior to this incident.  He told me that he had recently replaced the Fuel Rail Pressure Sensor because it had rusted out.  He stated that while the boat was idling, he did not notice anything wrong.  I asked Operator1 if anyone on the boat was wearing a life vest at the time of the accident and he told me no, but there were numerous vests on board the boat.  He added that everyone knew how to swim.  After the girls were transported, Operator1 put his boat on his trailer and pulled it from the lake.  I watched him remove the boat and them advised him that we were going to take custody of the boat while there was an ongoing accident investigation.  Operator1 told me he understood and unhooked the trailer from his truck. I was later advised that the boat is not insured.  I then towed the boat to the Lake Pleasant Operations Center to secure it.  Detective#1was advised of the call and stated that a Lake Patrol Detective would come out to the lake to evaluate the boat on Monday or Tuesday of the coming week.
  
  No diagram was attached due to it being a single vessel catching on fire.   My Office issued body camera was not on during this call as I was involved with helping the injured patients and neglected to activate it.
  