What was found
ACFT OWNER REQUESTED CLEANING OF HIS FUEL INJECTORS, WHICH WE DID. ALMOST COMPLETED WITH THE TASK, TIGHTENING THE NUT FOR THE NR1 CYL FUEL INJECTION LINE, NOTICED THAT THE LINE WAS VERY LOOSE, AND UPON FURTHER INSP FOUND THAT THE RETAINING CLIP THAT WAS SUPPOSED TO SECURE THE LINE TO AN ENGINE BRACKET WAS FALLING OUT AND NOT DOING ITS JOB. ALSO, NOTICED SOME BLACK STAINING ON ADJACENT ENGINE STRUCTURE. WHEN LINE WAS REMOVED, FOUND THAT APPROX 1" OF THE TUBING HAD BEEN WORN AWAY TO ABOUT HALF THICKNESS, AND IT WAS LEAKING FUEL OVER THE TOP OF THE ENGINE. INSPECTED THE OTHER FUEL LINES, AND ALSO FOUND NR 2 CYL FUEL INJECTION LINE ON OPPOSITE SIDE OF ENG ALSO HAD DAMAGE, HOWEVER THIS WAS CAUSED BY IGNITION LEADS THAT WERE RUBBING AGAINST THE LINE. NR2 LINE DAMAGE WAS LESS SEVERE AND IT WAS NOT LEAKING, BUT IT WAS NOT SERVICABLE. ORDERED AND INSTALLED NEW LINES. SECURED NR1 LINE WITH HEAVIER DUTY TYPE ADEL CLAMP, AND SECURED ALL IGNITION LEADS TO PREVENT FURTHER CHAFFING.