Best Injectors For LB7 Duramax – 2021 Top Picks Reviewed

| Last Updated: December 25, 2021

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Duramax engines have proven to be reliable and durable over their many years in production since 2001, but they are not without their problems.

The main problem they have is faulty fuel injectors. Changing injectors in LB7 Duramax is quite a labor-intensive task, and since they have a tendency to break a lot, it is wise to invest in a quality injector.

To help you out, we have compiled a list of the best injectors available for LB7 Duramax. 

Comparison of the Best Injectors For LB7 Duramax

  • Silver series remanufactured fuel injectors
  • Has 13 months unlimited mileage warranty
  • Best for the money remanufactured injector
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  • Provides a one-year limited warranty
  • Diesel injector super set plus is the runner-up
  • Has pre-installed O-rings and copper crush washers
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  • For 2001-2004 LB7 Duramax models
  • Has a two-year unlimited mileage warranty
  • Remanufactured and individually sold injectors
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Are All Injectors The Same?

All injectors are definitely not the same. Different kinds of injectors have been engineered throughout the years. Each one addresses the shortcomings of the previous one, hoping to improve on it. Today, there are even modern injectors controlled by computers and sensors that require very little maintenance.

The major types of injectors are:

Single-Point/Throttle Body Injectors

They are the oldest kind of injectors. These replaced the carburetor with a single fuel injector in the throttle body. Their main advantage was low maintenance and production cost.

Multi-point/Port Fuel Injectors

These injectors use separate injector nozzles for each cylinder’s intake port, ensuring every cylinder gets equal fuel. They improve efficiency drastically from throttle body injectors by improving the air-to-fuel ratio. They can be sequential, batch (fuel injected in groups), or simultaneous (fuel injected to all cylinders at the same time).

Sequential/Timed Fuel Injection

These are a small improvement over multi-point injectors. Instead of spraying all the fuel together, they use a timer to spray fuel, which helps reduce fuel hang around time while the engine is idling.

Continuous Injection

Continuous injectors are either single-point or multi-point injectors. As their name suggests, they send a continuous flow of fuel at all times but at variable rates.

Direct Injection

They inject fuel directly into the combustion chambers, removing all obstacles, and making injection most precise and efficient. 

Even within all these different types of fuel injectors, there are differences depending on the manufacturer and model. They all vary depending on their flow rate, pressure, impedance, nozzle types, and electric connections.

How to Choose LB7 Duramax Injectors

To get the best injector for your LB7 Duramax, it’s essential to keep the following tips in mind.


Due to emerging environmental concerns, maintaining a correct or "isometric" ratio of air and fuel for combustion has become increasingly important. Most of the fuel used in engines is petroleum. Due to its non-renewable nature, any waste must be avoided. A precise injector ensures full consumption of fuel and low pollutant emissions. 


A fuel injector’s primary role is to inject fuel precisely and in a timely manner into the cylinder’s intake port or combustion engine. To achieve that, high pressure is vital. The time for combustion is very limited. Therefore, to achieve high acceleration and power, it is necessary to inject fuel at great pressure immediately. If you have a low-pressure injector, your car will not be able to start as smoothly and will emit unnecessary pollutants.

Electronically Operated

Fuel combustion in engines comes with many inherent problems, including fuel loss, volumetric inefficiency, and non-uniform distribution of fuel, among others. These problems can be tackled with a modern and electronic injection system that is precise and efficient. Electronic fuel injection systems use sensors and a CPU to control the amount of fuel that goes into each cylinder. This results in more efficient fuel consumption. These are more expensive but definitely worth the cost.

Review of the Best Injectors For LB7 Duramax

Looking for the right fuel injector for your engine and its needs can be a frustrating process, especially if you are not a mechanic or car enthusiast. This article tries to make things easier for you by providing a list of some of the best injector models for LB7 Duramax and their complete reviews.

Best for the Money:
 Bostech DE651 Silver Series Remanufactured Fuel Injector


  • Has an unlimited mileage warranty
  • New seals and O-rings are installed
  • Conforms to legal U.S. emission standards
  • Every joining surface is lapped to precision
  • Each component is tested against original equipment specifications


  • Sold individually and not in sets

What Recent Buyers Report

Buyers of this model appear to be satisfied with the results and are amazed at the high quality and performance delivered by a low-priced product. Everything needed to install the injector is provided in the installation kit. In addition, no extra unwanted pollutant emissions or excess unburned fuel have been reported.

Why it Stands Out to Us

This injector comes with an unlimited mileage warranty for 13 months. It is very cheap considering fuel injectors can be quite expensive. It meets all the high-quality standards for fuel emissions. It also stands out because the manufacturers thoroughly test every part of the equipment, completely clean and polish it, then reassemble it. Every part is tested against original Bostech equipment.

Who Will Use This Most

If you have had a bad experience with injectors in the past and are looking for a better warranty, then this is the product for you. It has an unlimited mileage warranty. Plus, it would be best for those looking for ease of use since it is made using original Bostech parts and tested against original equipment specifications.

Bottom Line

Injectors can be very expensive to replace, which is why this model is a savior if you are on a budget. It provides great quality and precision at a low cost. Every component is thoroughly tested and re-calibrated. And with an unlimited warranty, you really cannot go wrong with this one.

Honorable Mention:
Duramax LB7 Diesel Injector Super Set Plus


  • All original Bosch parts are used
  • Comes with a core refund policy
  • Old springs are replaced with new ones
  • Gasket sets are also provided with the install kit
  • Uses original equipment specifications to certify all components of the used injector


  • Only for U.S. models of the Duramax LB7
  • Warranty is very limited, making people hesitant to invest in it

What Recent Buyers Report

Buyers give this LB7 Super Injector Set generally good reviews. Everything works fine once the hard part of installing it is over. Users are satisfied with the purchase and report improved engine performance and fewer waste emissions due to their high precision. Even after using it for miles, at which older versions would start to crack, this model seems to work fine.

Why it Stands Out to Us

This set of LB7 injectors is different than others. It uses cores of injectors that have already been sold but are returned in good condition to make new ones. Any changes that are needed on the used core are made accordingly. By using only original equipment, they guarantee a high standard and quality along with ease of fitting.

Who Will Use This Most

If you are an LB7 Duramax user of older models, then you are probably having trouble with your injector. If you are not sure what to do, or which injector to buy or how to fix the old one, then Dieselogic’s Injector Set will suit you perfectly. These injectors are cheaper because they are remanufactured, but that does not mean they do not deliver high quality. Everything has original equipment testing, putting the buyer at ease.

Bottom Line

This is a comparatively cheaper alternative. The set comes with eight injectors along with copper crush washers and O-rings. They might not be as cheap as refurbished injectors but are cheaper than brand new ones with all the properties of a new injector and without the failings that a refurbished one might have.

3. Bosch 0986435502 Stock Replacement Injector 01-04 6.6l GM Duramax LB7


  • Body is resistant to cracking
  • Come with an unlimited mileage warranty
  • Uses chrome-plated balls and seats to tackle erosion
  • All internal parts are new with only the outer casing remanufactured
  • Remanufacturing and assembling is done by Bosch for quality assurance


  • Sold separately instead of in sets
  • Requires a refundable core charge at the time of purchase

What Recent Buyers Report

Buyers of this product report complete satisfaction with this injector. The problems they were facing with the previous model were completely gone. There were no more engine starting difficulties or white smoke emissions. Users found that even with a big price tag, this purchase was not a waste but rather a good investment.

Why it Stands Out to Us

This model comes with an unlimited warranty, which is always a great plus. Even though it is remanufactured, every internal element is new and the only thing that is not new is the casing or housing. It also stands out because its body is resistant to cracking. Also, every element is tested and assembled by Bosch to ensure high quality and precision.

Who Will Use This Most

A lot of the issues related to LB7 injectors are due to poor fuel quality. To avoid fuel contamination and injector failure, you should use fuel filters. If this is something that you are concerned about, then consider Bosch injector because it uses filter pumps from FASS, AirDog, and BD for the best performance.

Bottom Line

This is a top-quality LB7 injector with additional points for fuel filters. The filters provide an extra layer of insurance that the fuel is consumed completely and has no contamination. If your main concerns are the quality of the product and the price tag, then you cannot go wrong with this product.

 4. Genuine Bosch Replacement Injectors


  • No core charges are included
  • New design eliminates the cracking problem of previous versions
  • Designed by OE (original equipment) standards and specifications
  • Uses hardened chrome-plated ball seats that prevent internal erosion
  • They come with copper crush washers and O-rings that are needed for installation


  • They are a little expensive

What Recent Buyers Report

This product has received overall great reviews. Everything that was wrong with the older version of LB7 injectors, this new one fixes perfectly. No cracks or leaks have been reported. Buyers also report that it takes some time to install them, but once you do, the engine runs faster, smoother, and quieter.

Why it Stands Out to Us

What is great about this product is that it is made and tested using the original equipment specifications. As a result of this, you will not have any problem installing them in your LB7 engine. Since changing the injector is a laborious process, especially for LB7 Duramax, Bosch has done a great job of fixing the issues of past models so that there is no need for frequent replacements.

Who Will Use This Most

Nobody wants to be stranded in the middle of the road with their engine refusing to start. And nobody wants to waste money on a problem that can easily be fixed. So if you are a user of LB7 Duramax manufactured in 2001-2004, then this is something you definitely need to buy.

Bottom Line

Bosch is a leading engineering company and has proven its worth by producing high-quality and durable products. This LB7 injector is no different. Using this, you will not only save fuel, but in the long run, money as well since you don’t have to keep buying or fixing the injector. This is definitely a wise choice that gives your engine a boost.

 5. Dieselogic Duramax LB7 6.6L Diesel Injector Set


  • Comes with new nozzles and parts
  • Copper crush washers and O-rings are pre-installed
  • Tested for spray plume uniformity and flow balance
  • Each component is re-certified using original equipment specifications
  • Uses EDM (Electro Discharge Machine) for precision-drilled spray holes


  • For contiguous U.S. customers only

What Recent Buyers Report

This LB7 injector model promises its customers an environment-friendly and high-precision injection system, and the reviews by users seem to agree with it. Any prior engine problems caused by injectors become a thing of the past. Loud knocking, white smoke, and acceleration problems have all been reported to be solved.

Why it Stands Out to Us

This injector is the only aftermarket model that can keep up with the high demand of modern diesel engines. They have a core return policy of up to six months as well. Every component is thoroughly tested against original equipment standards and specifications. It also includes a micro-finished seat and chrome-plated ball to help with erosion and water resistance.

Who Will Use This Most

This is a great option for anyone with an older 2001-2004 LB7 Duramax models. It uses all the modern methods and technologies to provide high-precision fuel injection. It also uses an exclusive fiber optic technology, i.e. NEO, that helps lower emissions for a greener environment. If you are an environment-cautious person, then this is a product you should definitely consider.

Bottom Line

These Dieselogic LB7 Fuel Injectors are modern, high-precision, and eco-friendly. Every component is tested and re-calibrated. If you want to return the core, they have a return policy of six months, so you'll have plenty of time to get it done.

Benefits of Investing in Quality Injectors

High-quality injectors can promise a lot of advantages. These include:

Decreased Pollution

Due to the increasing threat of global warming, it is vital to add as little harmful gas to the air as possible. Nowadays, modern manufacturers take this concern in hand when engineering fuel injectors. Fuel injectors perform the important function of injecting fuel to cylinders or combustion chambers. If they do not work efficiently and precisely, it can lead to unburned fuel and pollutants in the air. It is, therefore, important to invest in quality injectors even if it means pulling out a little extra cash.

Improved Car Performance

It is not just the environment that gets negatively affected due to poorly maintained injectors but also your car. Without proper fuel pressure administered by the injector, you will have trouble with acceleration because the fuel will not be able to meet the power demand. It can also lead to problems with starting the car and engine stalling. Overall, in the long run, it is not good for the health of your car, so you should invest in a quality injector.


If your injector is not of good quality and constantly needs repairing or changing, it can become very inconvenient. This is particularly true for an LB7 Duramax engine because they are more difficult to remove and can be labor-intensive. To avoid all the hassle, it is wiser to install a good, quality injector that will not need to be changed constantly. 

How to Install 6.6L Duramax Fuel Injectors

Make sure to follow the given steps to install a 6.6L Duramax fuel injector properly:

  1. Remove the copper washer from the injector using hand pliers.

  2. Make sure to clean all carbon and debris from the injector using small-tipped tools like a common toothpick.

  3. Place the injector in the end wrench, which is secured in a vise.

  4. Remove the nozzle nut using a torque wrench.

  5. Make sure to clean the surface between the new nozzle and the injector properly.

  6. Place the new nozzle on top.

  7. Screw the nozzle nut back in place and then put the injector back in the end wrench.

  8. Set torque wrench at 35 pounds/feet and secure the nozzle nut back in place.

  9. Take the copper provided in the injector kit and fix it on the injector using the transmission assembly lube.

Be careful when handling the injector. Its internal components are very small and can be easily lost if they fall out and can be hard to replace. Make sure to check out the video below for a more detailed instruction manual to help you if you have any confusion.


Injectors and their maintenance can be a costly and technical business but it is something we cannot get around, and any shortcuts will lead to disastrous results for your car’s engine and your pocket. It is important to buy the right injector for your engine according to its needs and to install it properly. In this article, we have tried to provide you with a full and comprehensive view of different ones available, why they are important, and how to install them. Hopefully, this will help make your choice easy.

People Also Ask

Since this is a somewhat technical issue and can be intimidating if you are not a mechanic, it is quite normal if you still have some questions regarding fuel injectors. We have tried to answer some frequently asked questions that might help you with your predicament. 

Do All LB7s Have Injector Issues?

Not all Duramax engines have an injector issue. It is most prevalent in earlier models and has since been improved. It depends on how much mileage you have on your engine. The more mileage you have, the more likely it is to cause problems. New injector models don’t have the same problems, but if you are using an old or used vehicle, it might not have been upgraded. 

How Do I Know if My Injector is Bad?

Signs of bad injectors include:

  • Poor acceleration
  • Engine idling
  • Engine overheating
  • Loud knocking noise from the engine
  • White smoke from the tailpipe

What Years Duramax Has Injector Problems?

Duramax models from the years 2001-2004 mainly seem to have injector problems. These issues have since been addressed by the manufacturer and improved upon. New and improved models are now available. Duramax has certainly proved its quality and reliability over its many years of production, and any issues in the earlier models are now mostly resolved.

Sean comes from the forums actually and drives an OBS Ford. He writes fantastic DIYs and knows his way around a camera, too. We keep him caffeinated and away from DPF filters to avoid another rant about recent emissions restrictions.