RedactedNarrative: Shortly after filling the boat with gas V1 was driven in reverse and then forward.  At this point the boat felt "bogged" down. Victims  both stated, getting 20-30- feet from the gas dock, the motor made a noise like it was hitting bottom or wrapped in vegetation and seemed to bog down.  Victim asked Operator if the prop was wrapped in vegetation.  Before Operator could answer, Victims heard a "pop" or "popping" sound and then the back exploded forward and up. Victim stated that "Operator is an experienced boat operator and had even told him that he had turned the blower on after fueling." Life jackets were used after the individuals jumped in the water to avoid the fire.