--- product_id: 46562413 title: "AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016)" brand: "accuratediesel" price: "€ 283.49" currency: EUR in_stock: true url: https://www.desertcart.pt/products/46562413-accuratediesel-duramax-diesel-injector-block-off-tool-cap-set-8 store_origin: PT region: Portugal --- # AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) **Brand:** accuratediesel **Price:** € 283.49 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) by accuratediesel - **How much does it cost?** € 283.49 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/46562413-accuratediesel-duramax-diesel-injector-block-off-tool-cap-set-8) ## Best For - accuratediesel enthusiasts ## Why This Product - Trusted accuratediesel brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description These tools are a "must have" for anyone who works on Duramax LML/LGH common rail fuel systems. When a Duramax common rail engine will not start, the very first thing to check is fuel rail pressure. If the pressure is less than 1,888 PSI one possible cause is a defective injector that is returning excess fuel back to the tank. A return flow volume test will verify if excessive return flow is the problem. These caps are then used to identify the individual cylinder that is at fault. The injection line is removed for one cylinder at a time and the cap installed on the fuel rail in place of the injection line. When the cylinder with the offending injector is capped, the rail pressure will rise and the truck will start. In some cases it can be highly advantageous to have multiple caps, because several injectors that return slightly too much fuel can have the same effect as a single injector with extremely high return flow. The injector block off tool can also be useful for diagnosing engine knocking sounds that may be attributable to an injector or a single cylinder problem particularly on engines where this capability is not available through the scan tool, or a bi-directional scan tool is not available. At least one of these would also be a great addition to the glovebox kit of every Duramax owner. When an injector malfunctions on a common rail engine damage to a piston or cylinder can occur very rapidly. When a common rail engine begins to misfire and blow excessive white smoke, the owner is highly advised to turn the engine off and call a tow truck to prevent major engine damage from occurring. An alternative would be to temporarily cap the injector for that cylinder for a short period. When working on high pressure fuel systems, always educate yourself first by reading appropriate factory service information, use common sense, and, above all, WEAR SAFETY GOGGLES! ## Features - A "must have" for anyone who works on LML / LGH Duramax - Very helpful for No-start diagnostics - Works on 2011 - 2016 Chevy / GMC Duramax - Most often used for locating an injector with high return rate that is causing a no-start condition - Made in the USA ## Images ![AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) - Image 1](https://images-na.ssl-images-amazon.com/images/I/51NIDlx1L7L.jpg) ![AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) - Image 2](https://images-na.ssl-images-amazon.com/images/I/51WBwZJVJUL.jpg) ![AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) - Image 3](https://images-na.ssl-images-amazon.com/images/I/41VNunvzGML.jpg) ![AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) - Image 4](https://images-na.ssl-images-amazon.com/images/I/51B9SkSgNFL.jpg) ![AccurateDiesel Duramax Diesel Injector Block-Off Tool/Cap (Set of 8) fits LML and LGH (2011-2016) - Image 5](https://images-na.ssl-images-amazon.com/images/I/41Q0VdmQE%2BL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/46562413-accuratediesel-duramax-diesel-injector-block-off-tool-cap-set-8](https://www.desertcart.pt/products/46562413-accuratediesel-duramax-diesel-injector-block-off-tool-cap-set-8) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-05-31*