What was found
DFW - UNABLE TO FEED FUEL FROM LEFT WING TANK. FUEL ONLY USED FROM RIGHT HAND TANK. LANDED DFW WITHOUT INCIDENT. CROSSFEED MANIFOLD APPEARED STUCK OPEN WITH RIGHT HAND PUMPS STRONGER THAN LEFT HAND PUMPS BURNING RIGHT HAND FUEL FIRST. PERFORMED FUEL QUANTITY BITE CHECKS, FUEL QUANTITY SYSTEM CHECK AND FUEL PUMP CHECK. NO FAULTS FOUND. COULD NOT DUPLICATE. SYSTEM GROUND CHECKED NORMAL OPERATION.