TM 9-2320-209-20-3-1 (f) Elbow CAUTION Fittings are made of soft brass. They can be stripped very easily if overtightened. Tighten fittings only enough to stop fuel leaking. NOTE Elbow at primary fuel filter on trucks with LD-465 engine is used for this typical procedure. FRAME 1 1. Using 7/8-inch open end wrench, hold bushing (l). Using 10-inch pipe wrench, screw in and tighten elbow (2). 2. Using 3/4-inch combination box and open end box wrench, screw on and tighten tube nut (3). 1. 2. 3. NOTE Follow -on Maintenance Action Required: Start engine. Refer to TM 9-2320-209-10. Check that fuel lines and fittings have no leaks. Stop engine. Refer to TM 9-2320-209-10. END OF TASK 4-28