While I would certainly agree its not a good idea to refuel a boat with the engine(s) running, I'm not sure that's the cause of the explosion in this case.
The boat looks like a skiff, with a 150 hp Yamaha on a bracket. The gentleman was apparently refueling using the portable gas cans shown on the deck.
I wonder if maybe the gentleman spill the fuel from the portable cans and what the ignition source was?
Jim
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