What was found
ALUMINUM VENT LINE FROM FUEL TANK PITTED TO FAILURE DUE TO CORROSION. NOTED WHEN TANKS WERE FILLED. FUEL LEAKED INSIDE CABIN REAR SIDE WINDOW. BARE TUBING IN CONTACT WITH VENT DUCTING. POINT OF CONTACT WAS SITE OF PIT. SUSPECT CAUSE DUE TO DISSIMILAR MATERIALS IN THE PRESENCE OF MOISTURE. SUBMITTER RECOMMENDS SHEATHING ENTIRE LENGTH OF VENT LINE WITH NON-CONDUCTIVE MATERIAL TO PREVENT CONTACT BETWEEN FUEL TANK VENT LINE AND VENTILATION DUCTING.