What was found
LEFT FUEL QTY UNRELIABLE. FLUCTUATED BETWEEN 2000 LBS LOW WITH 10000 LBS IN CTR, BALANCED FUEL. LATER LEFT TANK INDICATING LBS HIGH. CHRONIC PROBLEM. AIRCRAFT REMOVED FROM ETOPS. *S/D* THE LEFT MAIN TANK FQIS TANK UNITS AND COMPENSATOR WERE CHECKED FOR SECURITY AND CLEARANCE AND THE LO-Z CONNECTION TO TANK UNIT 13 (TS 302) WAS FOUND TO BE LOOSE. AFTER TIGHTENING THE CONNECTION A CAPACITANCE CHECK OF ALL TANK UNITS WAS PERFORMED WITH ALL VALUES WITHIN SPEC. THE REPAIR WAS ACCOMPLISHED 8/6/00 WITH SYSTEM OPERATION NORMAL TO DATE.