
Cummins QSB6.7 Fuel Injector 2011-2020: OEM 5579334
CUMMINS QSB6.7 FUEL INJECTOR 2011-2020: OEM 5579334

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine New, Cummins Fuel Injector, Cummins part number 5579334NX ( OEM Part Number 5579334 ).This part is primarily made for a Cummins QSB6.7, production years 2011-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 5579334 |
| Additional OEM | 5579334 |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490542570 |
| WEIGHT | 2.00 LBS |
SHIPPING OPTIONS
Ship Weight : 2.00 LBS
UPS Ground, 2nd Day Air, Next Day Air
SHIPPING POLICY
Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.
The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.
Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.
Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".
If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.
As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.
What is a Core Charge?
A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.
30 Day Core Charge Hold
You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.
The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.
The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.
All fluids must be drained.
If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.
Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.
Dependable fuel system operation starts with the Cummins QSB6.7 Fuel Injector 2011–2020, OEM Part Number 5579334. Designed for select Cummins QSB6.7 engines, this injector precisely meters fuel into the combustion chamber to support smooth, consistent engine function. Built to meet OEM specifications, it offers accurate fitment and reliable durability in demanding work environments. Common signs of a failing injector can include rough idle, misfires, hard starting, or increased fuel consumption, making proper replacement essential. Tamerx Diesel Products LLC provides trusted diesel components to help keep your Cummins engine operating cleanly and reliably.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2011 | Cummins | QSB6.7 | ||||
| 2012 | Cummins | QSB6.7 | ||||
| 2013 | Cummins | QSB6.7 | ||||
| 2014 | Cummins | QSB6.7 | ||||
| 2015 | Cummins | QSB6.7 | ||||
| 2016 | Cummins | QSB6.7 | ||||
| 2017 | Cummins | QSB6.7 | ||||
| 2018 | Cummins | QSB6.7 | ||||
| 2019 | Cummins | QSB6.7 | ||||
| 2020 | Cummins | QSB6.7 | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins QSB6.7 Fuel Injector OEM 5579334 is a precision-engineered fuel system component designed for 2011–2020 Cummins QSB6.7 diesel engines. It plays a critical role in delivering the correct amount of fuel into each cylinder at precisely timed intervals.
This injector is part of a high-pressure common rail fuel system. In this setup, fuel is pressurized by a high-pressure pump and stored in a shared fuel rail before being delivered to each injector. The injector then meters and sprays the fuel directly into the combustion chamber.
The Cummins QSB6.7 Fuel Injector OEM 5579334 is designed to:
- Deliver accurately measured fuel quantities
- Control injection timing with electronic precision
- Create a fine spray pattern for proper atomization
- Support efficient combustion
- Work seamlessly with the engine control module (ECM)
The ECM monitors engine speed, load, temperature, and other operating conditions. Based on this data, it signals the injector to open and close in rapid cycles, ensuring controlled fuel delivery.
Engineered to meet Cummins factory specifications, the OEM 5579334 injector provides proper fitment and compatibility with QSB6.7 engines. When functioning correctly, it supports smooth engine operation, balanced combustion, and reliable performance across a wide range of applications.
Fuel injectors operate under extremely high pressure and tight tolerances. Because of this, contamination and poor maintenance are the biggest threats to their longevity. The good news is that a few consistent habits can significantly extend their service life.
Clean fuel is the foundation.
To help prolong the lifespan of your fuel injectors:
- Replace the fuel filter at recommended intervals
- Use high-quality fuel from reputable sources
- Avoid running the tank consistently near empty
- Drain water separators regularly (for diesel engines)
- Follow proper oil change intervals
- Address check engine lights promptly
Dirt, rust, and water in the fuel system can clog injector nozzles and disrupt spray patterns. Even small amounts of contamination can affect combustion.
Running the tank very low can increase the risk of pulling debris from the bottom of the tank into the system.
It’s also important to maintain related components. A failing high pressure fuel pump or restricted filter can create inconsistent fuel delivery and strain the injectors.
Routine inspections and early diagnosis of drivability issues can prevent minor concerns from turning into costly repairs.
With proper maintenance and attention to fuel system health, you can help ensure your fuel injectors operate reliably for as long as possible.
Using the correct OEM 5579334 ensures proper fuel delivery and maintains consistent engine operation.
The Cummins 5579334 Fuel Injector delivers precise amounts of fuel into the combustion chamber.
Yes, the Cummins 5579334 is made to match the original parts for straightforward installation.
The Cummins 5579334 Fuel Injector installs into the cylinder head along the fuel rail.










































