TM 10-3930-659-34 4-22.  LEAK-OFF TUBES AND FUEL LINES REPLACEMENT (Con’t). NOTE Four leak-off tubes are installed the same way.  One leak-off tube is illustrated. 5. Install   leak-off   tube   (3)   on   two   tees   (1)   and tighten two nuts (2). 6. Tighten nut (4). FOLLOW-ON TASKS: •     Install exhaust manifold (see paragraph 4-21). TA708166 4-88