TM 9-2320-209-20-3-1 (2) Fuel hoses. CAUTION Fittings are made of soft brass. They can be stripped very easily if overtightened. Tighten fittings only enough to stop fuel leaking. NOTE Fuel return hose from secondary and final filter assemblies to return tube on trucks with LD-465 engine is used for this typical procedure. 1. Using 9/16-inch open end wrench, hold elbow (1) . Using 11/16-inch combination box and open end box wrench, screw on and tighten hose nut (2) . GO TO FRAME 2 4-21