As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PRE-FLIGHT THIS VALVE WHICH IS ATTACHED TO AN ELBOW ATTACHED TO GASCOLATOR; WAS DIFFICULT TO PUSH IN TO DRAIN. A SLIGHT PULL WAS MADE AND THE STEM CAME OUT IN HAND. FUEL BEGAN TO DRAIN AND THE FUEL SELECTOR HAD TO BE SHUT OFF. VALVE WAS REMOVED AND THE RETAINING COLLAR WAS FOUND SEPARATED FROM STEM END. SUBMITTER STATED IF STEM FELL OUT IN-FLIGHT - THE ENGINE WOULD STOP. THE VALVE WAS REPLACED.