RedactedNarrative: According to the operator, he and his grandson had just launched the boat at the boat ramp on Hwy. 69 near Warrenton into Brown's Creek. He said the boat wasn't starting so he had his grandson pump the priming bulb to get gas to the engine. Then when he tried to start it the outboard motor exploded and set the boat on fire. The two were wearing their PFD's and they jumped into the water to swim ashore from about 150-200 yards away.  He advised that he wasn't able to get all the way to the shore and his grandson pulled him to shore for about the last 50 yards.