What was found
PILOT REPORTED ERRATIC FUEL QUANTITY INDICATION DURING FLIGHT. PROBLEM COULD NOT BE DUPLICATED ON THE GROUND. INVESTIGATION REVEALED THE LOA-Z WIRE LUG AT FUEL QUANTITY PROBE NR 7 WAS VERY CLOSE TO THE FORWARD FUEL VENT LINE AND WAS APPARENTLY, THROUGH TEMPERATURE CHANGE OR WING MOVEMENT, RUBBING ON LINE EFFECTIVELY GROUNDING THE LO-Z LUG. INSTALLATION MAKES IT DIFFICULT TO ALLOW SUFFICIENT MOVEMENT OF EITHER LINE OR TRANSMITTER TO ALLEVIATE CONTACT. LINE WAS REPOSITIONED AS FAR AS POSSIBLE AND A TEFLON STRAP WAS INSTALLED AS AN INSULATOR. THIS APPEARS TO BE MORE A DESIGN FLAW THAN AN INSTALLATION ERROR AND MAY BE RECTIFIED PERHAPS BY SB USING A SIMILAR METHOD AS ABOVE.