
Cummins QSB6.7 Fuel Injector 2011-2020: OEM 5579334 ( Set of 6 )
CUMMINS QSB6.7 FUEL INJECTOR 2011-2020: OEM 5579334 ( SET OF 6 )

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-SET ( 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 | 5263262, 5579334, 5579334RX |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490542587 |
| WEIGHT | 12.00 LBS |
SHIPPING OPTIONS
Ship Weight : 12.00 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.
A complete injector replacement solution, the Cummins QSB6.7 Fuel Injector 2011–2020, OEM Part Number 5579334, is available as a set of 6 for comprehensive fuel system service. Designed for select Cummins QSB6.7 applications, each injector delivers precise fuel metering to help maintain smooth and consistent engine operation. Manufactured to meet OEM specifications, this matched set ensures accurate fitment and balanced fuel distribution across all cylinders. Replacing all six injectors at once can help resolve issues such as rough idling, misfires, hard starts, or uneven fuel delivery. Tamerx Diesel Products LLC offers dependable diesel components to help keep your Cummins engine operating efficiently 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)
Proper maintenance is essential to protect your Cummins QSB6.7 Fuel Injector Set OEM 5579334. Because these injectors operate under extremely high pressure and tight tolerances, keeping the fuel system clean and properly serviced is critical for long-term reliability.
Fuel contamination is one of the most common causes of injector wear. Preventative care helps maintain consistent spray patterns and balanced cylinder operation.
To properly maintain your injector set:
- Replace fuel filters at manufacturer-recommended intervals
- Use clean, high-quality diesel fuel from reputable sources
- Drain water separators regularly
- Inspect fuel lines for leaks or damage
- Address check engine lights or fault codes promptly
- Avoid running the engine with low fuel levels
Clean fuel is critical because debris or water can damage internal injector components and affect atomization. Even minor contamination can lead to uneven fuel delivery or restricted flow.
It is also important to maintain proper fuel pressure. If the high-pressure pump or fuel rail develops issues, it can place additional stress on the injectors.
When replacing injectors, ensure proper installation procedures are followed, including correct torque specifications and sealing washer replacement. Balanced installation helps maintain uniform fuel delivery across all six cylinders.
By following routine maintenance practices and keeping the entire fuel system in good condition, you can help extend the service life of your Cummins QSB6.7 Fuel Injector OEM 5579334 set and maintain dependable engine operation.
Fuel injectors deliver precise amounts of fuel into the engine for proper combustion. When one begins to fail, engine operation can quickly become rough or inconsistent. Recognizing the warning signs early can help prevent more serious damage.
One of the most common symptoms is a rough idle. The engine may shake or feel uneven, especially when stopped.
Other common signs of a bad fuel injector include:
- Engine misfires
- Hard starting or extended cranking
- Decreased fuel efficiency
- Strong fuel odor
- Excessive exhaust smoke
- Loss of acceleration
- Check engine light with injector-related codes
Clogged injectors can restrict fuel flow, causing cylinders to run lean. On the other hand, leaking injectors may allow too much fuel into a cylinder, which can create smoke and dilute engine oil.
In some cases, electrical failure inside the injector can prevent it from opening or closing properly.
Because fuel system components work together, professional diagnostics are important. A technician may perform balance tests, fuel pressure checks, and scan for trouble codes to confirm whether an injector is faulty.
Addressing injector issues quickly helps protect pistons, valves, and overall engine reliability.
Signs of a failing injector may include cylinders misfiring, rough idle, or diagnostic trouble codes.
Yes, the Cummins 5579334 injectors are designed to integrate with the engine’s factory fuel rail, lines, and controls.
Yes, checking system operation with diagnostic tools after installation helps confirm correct fuel delivery.
Faulty injectors from the 5579334 set can cause combustion inefficiencies that may influence emissions sensor outputs.





















































