What was found
WHILE READING THE ACFT HOUR METER, A STRONG FUEL SMELL WAS NOTICED. A FUEL STAIN WAS NOTICED UNDER THE LEFT WING STARTING AT THE INBD ENGINE NACELLE AND SEEPING DOWN THE MAIN WING SPAR TO THE INBD MAIN GEAR DOOR. CROSS-FEED FUEL LINE HAD BEEN CHAFED AFT OF THE TURBOCHARGER BY A STRINGER AND WAS LEAKING. UNFORTUNATELY, THESE LINES MAINTAIN A POSITIVE PRESSURE ON THEM WITH NO WAY TO TURN OFF THE FUEL. IT IS SUBMITTER'S RECOMMENDATION THAT CESSNA PROVIDE SOME MEANS TO ENABLE THE PILOT TO TURN OFF THE FUEL SUPPLY TO THESE FUEL LINES.