What was found
ON CLIMB OUT THRU FL260 RECEIVED FUEL CONFIG EICAS MSG & FUEL CONFIG LIGHT ILLUMINATED. RAN QRH BUT INITIALLY COULD NOT CONFIRM OR SUSPECT FUEL LEAK. BALANCED FUEL IN TANKS, BUT NOTICED TOTALIZER FUEL QTY CONTINUED TO GO WELL BELOW CALCULATED & EXPECTED FUEL QTY ALONG ROUTE OF FLIGHT. DECLARED EMER & DIVERTED, UNEVENTFULLY FOR MX INSPECTION & DETERMINATION OF FUEL LEAK. PERFORMED VISUAL INSPECTION OF LT & RT WINGS & CTR FUSELAGE SECTION, NO FUEL LEAKS NOTED. FOUND O RING CUT ON LT ENG FUEL FILTER. NO FUEL MIGRATION NOTED. ACFT BLOCKED IN WITH 7.0 EACH SIDE. NO FUEL MIGRATION INTO CTR TANK, CTR TANK AT 0 LBS. R & R LT ENG FUEL FILTER & O RINGS IAW AMM 73-11-02-4. GND RAN LT ENG IAW JRH, NO LEAKS NOTED. OK FOR SERVICE.