Overview Reviews Product Description Helps in identification of faulty diesel fuel injectors and used to diagnose engine knock sounds. Install the cap on the fuel rail in the place of the injection line. When the cylinder with the failed injector is capped, the rail pressure will rise and the vehicle will start. Set comes with five different caps. Lisle Tools Catalog Product Videos Custom Field Harmonization code HTS #8205595510 Manufacturing country US Product Reviews Write a Review Write a Review × Lisle 5 Pc. Injector Rail Fuel Line Cap Set 10810 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *