As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE FIRE DURING START UP. FIRE EXTINGUISHED ON GROUND. INSPECTED ENGINE COMPARTMENT AFTER FIRE AND FOUND THAT FLEXIBLE FUEL LINE FROM FUEL PUMP TO CARBURETOR HAD COME LOOSE AT THE B-NUT ON ENGINE DRIVEN FUEL PUMP AND WAS LEAKING FUEL.