Bonbo EN-47589 9011 Diesel Rail Fuel Injector Block Off Cap Tool Set, Fuel Pressure Test Adapter Kit for 2003-2009 Dodge Ram Cummins 5.9L, and 2001-2005 GMC Chevy Duramax 6.6L LB7 LLY, 6-PCS Set

["【Application】 Engineered to precise OEM standards. It is fully compatible with 2003-2009 Dodge Ram 2500/3500 Cummins 5.9L ISB Diesel, and fits 2001-2005 GMC/Chevy 2500/3500 Duramax 6.6L (LB7 / LLY) engines, including Medium Duty GMC Topkick C4/C5 and Hummer H1 Alpha.","【Diagnose Fuel Pressure Problems Quickly】 EN-47589 Fuel Rail Block Off Cap Tool is designed to isolate faulty diesel injectors during fuel pressure diagnostics. By blocking off individual injector ports on the fuel rail, technicians can quickly identify leaking injectors, excessive return flow, hard-start conditions, and low rail pressure issues.","【Identify Faulty Injectors with Confidence】 When a defective injector returns excessive fuel to the tank, rail pressure may drop below starting requirements. This block off cap allows you to isolate each injector circuit and determine which cylinder is causing pressure loss, injector imbalance, rough idle, or engine knocking.","【Heavy-Duty Steel & Copper Construction】 Manufactured from premium high-strength steel and copper materials for excellent durability, wear resistance, and corrosion protection. Precision-machined threads provide a secure fit and reliable sealing during diagnostic testing.","【6-Piece Professional Diagnostic Set】 Includes six 9011 fuel rail block off caps for testing multiple cylinders as needed. Highly advantageous when multiple injectors are leaking simultaneously. If you are not satisfied with our products, you can request a refund within 30 days. Backed by a 12-month warranty for your peace of mind."]