RedactedNarrative: A male was in the process of purchasing the vessel and the engine kept stalling out in the river.  He made it back to dock and called the owner.  Owner stated that keep priming the engine and it should start.  The male said its fuel injected and does not need to keep priming the engine.  He stated the engine again and the cover blew up and he was able to jump out of the boat.  Subject had minor injury. Vessel total loss.  The dock was also damaged.
  
  Officer suspected a battery was added to the vessels electrical system.  The act of squeezing the ball while the engine was running could have resulted in fuel leakage and fumes in the engine.  If the extra battery was attached incorrectly the electrical system could have been increased to 24 volts and overloading the system causing overheating or a spark at the engine starting a fire.  Point of ignition was not able to be determine given the amount of charring and melting of the engine.