What was found
LT AND RT FUEL TANK GAUGES FLUCTUATE /- 700 POUNDS DURING FUELING, CLIMB AND CRUISE. ACFT GROUNDED. FQIS BITE IAW FIM 28-41, TASK 801 SHOWS FAULT CODES 28-41108 COMPENSATOR DATA BAD AND 28-41208 COMPENSATOR DATA BAD FOR NR 1 AND NR 2 TANKS RESPECTIVELY AND DEGRADED ACCURACY FAULTS LOGGED FOR EACH OF THE LAST 25 LEGS. ACCOMPLISHED T/S FOR FAULTS 28-41108 AND 28-41208 IAW FIM 28-41, TASK 807. INITIAL EVALUATION (SELF-TEST) CONFIRMED FAULTS. SUMPED TANKS IAW MM 12-11-00-680-801 APPROXIMATELY TWO CUPS OF WATER FOUND IN EACH. AFTER WATER WAS REMOVED, FQIS SELF-TEST SHOWED NO FAULTS. PERFORMED FQIS OPS TEST IAW MM 28-41-00 - ALL TESTS PASS.