What was found
WITH CENTER TANK PUMPS ON, RIGHT FUEL QUANTITY IS BEING BURNED AT ABOUT 150 LBS/HR CAUSING A FUEL IMBALANCE OF ABOUT 600 LBS. BEFORE CENTER TANK IS EMPTY. FUEL BURNS WERE NORMAL INDICATING NO LEAK. LEFT AND CENTER TANKS DID NOT SHOW A CORRESPONDING INCREASE AS THE RIGHT TANK WAS DEPLETED. GROUNDED - YES. REMOVED TANK UNITS 1,2,7,8,9,10. REPLACED #2 MAIN TANK UNITS 1,2,7,8,9,10 INSTALLATION TEST PASSES REF B737-800 AMM 28-41-21-400-801. (REF ASA LOGPAGE 60394051)