TM 9-2320-209-20-3-1 (3) Fuel line fittings. (a) Tube coupling CAUTION Fittings are made of soft brass. They can be stripped very easily if overtightened. Tighten fittings only enough to stop fuel leaking. NOTE Tube coupling joining fuel supply tube from fuel tank and fuel supply tube to filter on trucks with LD-465 engine is used for this typical pro- cedure. 1. Screw tube nuts ( 1 and 2) into coupling ( 3). 2. Using 7/8-inch open end wrench, hold coupling ( 3). Using 3/4-inch combina- tion box and open end box wrench, tighten two tube nuts ( 1 and 2). NOTE Follow-on Maintenance Action Required: 1. Start engine. Refer to TM 9-2320-209-10. 2. Check that fuel lines and fittings have no leaks. 3. Stop engine. Refer to TM 9-2320-209-10. END OF TASK TA 087082 4-23