Synopsis: Vessel #1 had briefly stopped with the engine turned off. Upon an attempt to restart the engine the vessel exploded and began to burn. The operator was ejected upwards and fell to the water. 
 
The PWC continued to burn until being extinguished with a mp by a nearby dock crew.  Extensive fire damage prevented a determination of a possible fuel leak source or cause  the fuel tank was nearly empty however did not explode or burn.  the fire primarily was located at the engine and stern portion of the PWC.  The operator was taken to the hospital complaining of back pain.
St. Petersburg