RedactedNarrative: Operator advised this was the first time they had taken V1 out all year. While traveling north up the Narrows, she heard a popping and cracking noise coming from the motor area. She stopped V1 and opened the engine compartment where she saw smoke and flames. The occupants were able to use a fire extinguisher to put out the fire.  It was determined that they had failed to inspect and/or detect a fuel leak which had allowed fuel to accumulate in the engine compartment.