Ford 2017–2022 Super Duty 6.7L OEM Fuel Injector Return Line Hose Assembly HC3Z-9A564-A This OEM fuel injector return line hose assembly is designed specifically for Ford Super Duty trucks equipped with the 6.7L diesel engine. It safely routes excess fuel from the injectors back to the fuel system, helping maintain proper fuel pressure and efficient injector operation. Over time, worn or damaged return lines can cause fuel leaks, pressure loss, or performance issues. Replacing the return line hose assembly with a genuine OEM part restores proper fuel flow, helps prevent leaks, and supports reliable engine performance. Built to factory specifications, this assembly ensures a precise fit, long-lasting durability, and dependable operation for your vehicle.