RedactedNarrative: Watercraft was drifting while the passengers fished. The operator was attempting to start the motor when the engine started on fire and flames burned two of the passengers. Another boat picked up all passengers and transported them back to the boat access, where they met law enforcement and first responders. The passengers were cleared by ambulance. The fire department arrived to assist with removal of the burned boat however the boat sank before they were able to recover it. Life jackets were being worn at the time of the incident. Alcohol was not a factor. The boat was a Total Loss.