TM 9-2320-209-20-3-1 (f) Elbow NOTE Elbow at primary fuel filter on trucks with LD-465 engine is used for this typical procedure. 1. Using 3/4-inch combination box and open end box wrench, unscrew and take off tube nut (1) . 2. Using 7/8-inch open end wrench, hold bushing ( 2). Using 10-inch pipe wrench, unscrew and take off elbow (3) . END OF TASK TA 087077 4-18