TM 9-2320-209-20-3-1 (3) Fuel line fittings. (a) Tube coupling 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 procedure. 1. Using 7/8-inch open end wrench, hold tube coupling (1). Using 3/4 inch com- bination box and open end box wrench, unscrew tube nuts ( 2 and 3) and take off tube coupling (1) . END OF TASK TA 087074 4-13