---
product_id: 46562406
title: "Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap"
brand: "accuratediesel"
price: "$117"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/46562406-duramax-lbz-lmm-diesel-injector-block-off-tool-cap
store_origin: NZ
region: New Zealand
---

# 2500+ PSI fuel rail pressure test Fits 2006-2010 Duramax LBZ/LMM & Cummins 6.7L Replaces Miller 9864 with precision fit Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap

**Brand:** accuratediesel
**Price:** $117
**Availability:** ✅ In Stock

## Summary

> 🛠️ Diagnose like a pro, drive with confidence!

## Quick Answers

- **What is this?** Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap by accuratediesel
- **How much does it cost?** $117 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/46562406-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

- • **Durable & Reliable:** Built to OEM standards, replacing Miller 9864 for trusted performance
- • **Essential Glovebox Gear:** A must-have tool for every Duramax owner to avoid emergency breakdowns
- • **Boost Diagnostic Accuracy:** Enables precise fuel return flow testing to prevent costly engine damage
- • **Multi-Model Compatibility:** Works seamlessly with Duramax 6.6L (LBZ/LMM) and Cummins 6.7L engines
- • **Pinpoint Injector Issues Fast:** Quickly isolate faulty injectors causing no-starts or misfires

## Overview

The Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap is a precision diagnostic accessory designed for 2006-2010 Chevy/GMC Duramax 6.6L engines and compatible with Cummins 6.7L models (2007-2021). It enables technicians and enthusiasts to isolate faulty injectors by capping individual fuel lines, ensuring accurate fuel return flow testing and preventing engine damage caused by injector failures. This tool replaces the Miller 9864 and is an essential addition to any professional or DIY mechanic’s toolkit.

## 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  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 |
|---------------|-------|
| Manufacturer | AccurateDiesel |
| Brand | AccurateDiesel |
| Item model number | 9011-1 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 9864-1 |

## Product Details

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

## Images

![Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap - Image 1](https://m.media-amazon.com/images/I/719Y6CefRDL.jpg)
![Duramax LBZ/LMM Diesel Injector Block-Off Tool/Cap - Image 2](https://m.media-amazon.com/images/I/71fTtOSBAML.jpg)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-20*