---
product_id: 46562406
title: "AccurateDiesel Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap"
brand: "accuratediesel"
price: "$58.49"
currency: USD
in_stock: true
category: "Accurate Diesel"
url: https://www.desertcart.us/products/46562406-accuratediesel-duramax-lbz-lmm-diesel-injector-block-off-tool-cap
store_origin: US
region: United States of America
---

# 2500+ PSI fuel rail pressure test Fits 2006-2010 Duramax LBZ/LMM & Cummins 6.7L Precision metal build with threaded inlet AccurateDiesel Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap

**Brand:** accuratediesel
**Price:** $58.49
**Availability:** ✅ In Stock

## Summary

> 🔧 Don’t let a bad injector stall your hustle—diagnose like a pro!

## Quick Answers

- **What is this?** AccurateDiesel Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap by accuratediesel
- **How much does it cost?** $58.49 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/46562406-accuratediesel-duramax-lbz-lmm-diesel-injector-block-off-tool-cap)

## Best For

- accuratediesel enthusiasts

## Why This Product

- Trusted accuratediesel brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Glovebox-Ready:** Keep it handy for emergency injector troubleshooting on the go
- • **Essential Diagnostic Tool:** Ideal for detecting high return flow and preventing costly engine damage
- • **Multi-Model Compatibility:** Works seamlessly with Duramax 6.6L (LBZ/LMM) and Cummins 6.7L engines
- • **Durable Metal Construction:** Built tough to withstand high-pressure common rail systems
- • **Pinpoint Injector Issues Fast:** Quickly isolate faulty injectors causing no-starts or misfires

## Overview

The Duramax LBZ/LMM Diesel Injector Block-Off Tool is a precision metal cap designed to isolate faulty injectors by capping fuel rails on 2006-2010 Chevy/GMC Duramax 6.6L engines and compatible Cummins 6.7L models. It enables quick detection of high return fuel flow causing no-start conditions or engine misfires, helping prevent severe engine damage. A must-have diagnostic tool for professional-grade maintenance and emergency repairs.

## Description

When a Duramax common rail engine will not start, one of the very first things to check is fuel rail pressure. If the pressure is less than 2,500 PSI (LB), one of the most likely causes 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. This cap is 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 excessive return flow. To purchase a complete set of block off tools, please see our other desertcart listings. 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 Duramax common rail fuel systems
- Replaces Miller 9864
- Fits 2006 - 2010 Chevy / GMC Duramax 6.6L ( LBZ and LMM)
- Most often used for locating an injector with high return rate that is causing a no-start condition
- NOTE: This tool is also compatible with Cummins 6.7L Applications (2007 - 2021)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01LXCMHC4 |
| Best Sellers Rank | #3,697,422 in Automotive ( See Top 100 in Automotive ) #14,292 in Automotive Replacement Fuel Injectors |
| Brand | AccurateDiesel |
| Brand Name | AccurateDiesel |
| Inlet Connection Type | Threaded |
| Manufacturer | AccurateDiesel |
| Material | Metal |
| Material Type | Metal |
| Model Number | 9011-1 |
| Number of Ports | 1 |
| Specification Met | OSHA |
| Unit Count | 1.0 Count |
| Valve Type | Ball Valve |

## Product Details

- **Material:** Metal
- **Brand:** AccurateDiesel
- **Inlet Connection Type:** Threaded
- **Number of Ports:** 1
- **Specification Met:** OSHA
- **Manufacturer:** AccurateDiesel

## Images

![AccurateDiesel Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap - Image 1](https://m.media-amazon.com/images/I/719Y6CefRDL.jpg)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-11*