As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CHANGING DEFECTIVE FUEL TANK SELECTOR VALVE (LEFT), FOUND MAIN FUEL LINE TO BOOST PUMP HAD A CRACKED COLLET. NEW LINE INSTALLED. SUBMITTER STATED LEAK OR FAILURE OF THIS LINE COULD CAUSE ENGINE FAILURE AND/OR FIRE. CAUSE OF FAILURE UNKNOWN. (X)