Complete the fuel injector replacement in your 2017-2019 Chevy/GMC 6.6L L5P Duramax with a new set of Fuel Injector Lines. On some engines the fuel injector lines are considered a "one-time-use" component and need to be replaced when new fuel injectors are installed. It's always a good idea to replace fuel injector lines when replacing injectors especially after damaged components from fuel contamination. When repairing injectors due to fuel contamination, it is also recommended that you replace fuel injector lines to avoid contaminating your new fuel injectors. Shop now at XDP and get Fuel Injector Lines from the top brands like Fleece, DTech, Dorman, PurePower, Industrial Injection, and many more!