As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL QUANTITY INDICATORS SHOWING DIVERGING VALUES BETWEEN LEFT AND RIGHT TANKS. FLIGHT DIVERTED TO ORD. *S/D* ENGINE FUEL FEED SYSTEM AND FUELING SYSTEM PRESSURIZED AND CHECKED FOR TRANSFER OR LEAKS. CHECKED CROSSFEED VALVE FOR PROPER OPERATION. RAN ENGINES TO CHECK FOR UNEQUAL FEED. CHECKED MAIN TANK VENTS. BITE CHECK OF FQIS PROCESSOR. ALL CHECKS PERFORMED 5/16/00 AT ORD WITH RESULTS NORMAL. TO THIS DATE THE REPORTED PROBLEM HAS NOT REOCCURRED.