As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GROUND SEAL TEST TO THE FUEL SYSTEM, FOUND FUEL LEAKING FROM THE VENT TUBE OF ENGINE DRIVEN FUEL PUMP. ACCORDING TO THE STRUCTURE AND FUNCTION OF THE PUMP, IT'S ONLY BROKEN SEAL DIAPHRAGM BETWEEN THE LOW PRESSURE SCREW AND THE PUMP BODY CAN CAUSE FUEL LEAKING FROM THE VENT TUBE.