As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEW REPLACEMENT PARTS FOR THE ANTI-SIPHON VALVE ASSEMBLY ARE BEING MFG INCORRECTLY. PROBLEM IS THE FLAPPER ASSEMBLY GASKET AND BACKUP PLATE WERE TRIMMED INCORRECTLY AND HINGE IS EXPOSED LEAVING A GAP WHERE FUEL CAN BE SIPHONED OUT DURING FLIGHT IF THE FUEL CAP WERE TO COME OFF IN FLIGHT. MFG HAS BEEN NOTIFIED OF PROBLEM.