What was found
PILOT REPORTED RT FUEL GAUGE STUCK ON APPROX ONE-THIRD FULL, NO MATTER WHAT ACTUAL LEVEL WAS. REMOVED GAUGE AND FOUND PIECE OF FOAM INSULATION THAT IS GLUED TO UNDERSIDE OF GLARE SHIELD HAD BECOME LODGED AROUND NEEDLE, PREVENTING IT FROM MOVING. THIS INSULATION WAS FALLING APART AND COVERING COOLING HOLES IN AVIONICS, ETC.