What was found
AT CRUISE 360 ALL FUEL PUMPS ON CENTER TANK FUEL DEVELOPED 1000 IMBALANCE ON THE RIGHT TANK. SHUT OFF RT PUMPS, BURNED OFF LEFT TO BALANCE 1 & 2 AND HAD NO FURTHER PROBLEMS. GROUNDED - YES. ACCOMPLISHED GVI AROUND EXTERNAL A/C LOOKING FOR FUEL LEAKS, NONE FOUND. FQIS BITE PER FIM 28-41 TASK 801 SHOWED NO FAULTS IN CURRENT STATUS. FUEL X- FEED VALVE FUNCTIONAL TEST PER AMM 28-22-00 TESTED NORMAL. ACCOMPLISHED FUEL STICK TO FLIGHT DECK INDICATION COMPARISON CHECK PER AMM 28-41-00. PRIOR TO FUELING BOTH LT AND RT TANK WITHIN LIMITS. REFUEL A/C AND DID COMPARISON CHECK AGAIN, BOTH TANKS STILL WITHIN LIMITS. FUEL QUANTITY SYSTEM GROUND TEST NORMAL.