What was found
(CAN) DURING FUELING PROCEDURES, IT WAS NOTICED BY THE PILOT THAT THE LT FUEL GUAGE WAS READING INACCURATE. A DIP OF THE FUEL TANK CONFIRMED THAT THE FUEL INDICATOR WAS READING .5 TANK MORE FUEL THAT WHAT WAS ACTUALLY ON BOARD THE ACFT. UPON REMOVAL OF THE FUEL GUAGE FROM THE FUEL TAKE, INSPECTION REVEALED THAT THE SPLINE DRIVE GEAR FOR THE FUEL INDICATOR HAD EXCESSIVE FOR AND AFT MOVEMENT PERMITTING THE SPLINES TO BECOME DISENGAGED FROM THE FLOAT DRIVE GEAR. THIS RESULTED IN THE INDICATOR DRIVE GEAR TO SLIP TEETH AND PERMIT INACCURATE READINGS, THEREFORE MAKING THE PILOT BELIEVE THEY HAD MORE FUEL ONBOARD THAN THEY ACUTALLY DID.