On 05-31-09 after refueling the vessel, the operator had started the engine which resulted in a explosion of gas vapors in the engine compartment.  The operator stated he had the ventilation blower running before and after the refueling process.  The two passengers and the operator then jumped overboard and begun to swim towards the shore.  An off duty Boating Unit Deputy from Yakima County Sheriff's Office was on scene at the time of the incident.  Deputy was approx. 75 yards from the incident and gave assistance to the subjects.  a 3 y/o female was the only one wearing a coast guard approved PFD.  There were no intoxicants or drugs involved in this incident.  The cause of the explosion appeared to be a loose ground wire connected to the alternator, and a leaking fuel filler hose.  The female was transported to the hospital by ambulance and treated for burns.  The vessel was inspected and released to the owner.
Naches                        