As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE PA-18 APPLICATION, THE AIR BOX IS BOLTED TO THE BASE OF CARBURETOR. THE AN 500 SCREWS ARE SAFETIED WITH CRES WIRE. THESE FASTENERS COME LOOSE AND ALLOW THE FLOAT BOWL TO WORK LOOSE FROM THE THROTTLE BODY CREATING A LEAKING CONDITION, AND A RICH FUEL MIXTURE. FIX IS TO UPGRADE FASTENERS TO 4 EACH 15-B1P7 SCREWS AND 4 EACH 78-A110 LOCKING TABS.