What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) After refueling the aircraft the pilot taxied to the north end runway (18) for takeoff. Due to incoming traffic he decided to taxi back to the south end for departure. While still on the taxiway at the south end of the runway (36) the aircraft's engine stalled. The pilot stated that he attempted a "hot start" with no success. He moved the mixture to the idle cut off position and shut off the electric fuel pump. During the second start he heard a small backfire and saw some smoke coming from the engine cowling. The pilot and passenger exited and attempted to put out the engine fire. A bystander helped them extinguish the engine fire.
As the FAA filed it
(-23) AFTER REFUELING THE AIRCRAFT THE PILOT TAXIED TO THE NORTH END RUNWAY (18) FOR TAKEOFF. DUE TO INCOMING TRAFFIC HE DECIDED TO TAXI BACK TO THE SOUTH END FOR DEPARTURE. WHILE STILL ON THE TAXIWAY AT THE SOUTH END OF THE RUNWAY (36) THE AIRCRAFT'S ENGINE STALLED. THE PILOT STATED THAT HE ATTEMPTED A "HOT START" WITH NO SUCCESS. HE MOVED THE MIXTURE TO THE IDLE CUT OFF POSITION AND SHUT OFF THE ELECTRIC FUEL PUMP. DURING THE SECOND START HE HEARD A SMALL BACKFIRE AND SAW SOME SMOKE COMING FROM THE ENGINE COWLING. THE PILOT AND PASSENGER EXITED AND ATTEMPTED TO PUT OUT THE ENGINE FIRE. A BYSTANDER HELPED THEM EXTINGUISH THE ENGINE FIRE.