
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, OEX Reman Fuel Injector, OEX Reman part number 5579334RI ( 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 | 00840490542556 |
| 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.
Consistent fuel delivery is critical for proper engine operation, and the Cummins QSB6.7 Fuel Injector 2011–2020, OEM Part Number 5579334, is designed for dependable fitment and functionality. Engineered for select Cummins QSB6.7 applications, this injector precisely meters fuel into the combustion chamber to support smooth and efficient operation. Manufactured to meet OEM specifications, it ensures accurate installation and reliable communication with the engine’s fuel system. Symptoms of a failing fuel injector can include rough idling, misfires, increased fuel consumption, or hard starting, making timely replacement essential. Tamerx Diesel Products LLC provides quality diesel components you can trust to keep your Cummins engine running consistently 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)
Precise fuel delivery is essential in modern diesel engines, and the Cummins QSB6.7 Fuel Injector OEM 5579334 plays a critical role in maintaining that precision. Designed for 2011–2020 Cummins QSB6.7 applications, this injector ensures the correct amount of fuel is delivered at the exact right time during each combustion cycle.
In a high-pressure common rail system, fuel injectors directly influence combustion quality. Even minor inconsistencies in fuel delivery can affect engine smoothness, efficiency, and emissions control.
The Cummins QSB6.7 Fuel Injector is important because it:
- Delivers accurate fuel metering to each cylinder
- Controls injection timing for proper combustion
- Produces a fine spray pattern for efficient atomization
- Supports stable engine operation under varying loads
- Helps maintain emissions compliance
The injector works in coordination with the engine control module (ECM), which monitors engine speed, load, and temperature. Based on this data, the ECM signals the injector to open and close in rapid, precisely timed intervals.
If an injector becomes worn or restricted, it can lead to rough idle, uneven cylinder performance, increased fuel consumption, and potential diagnostic fault codes.
The OEM 5579334 fuel injector is engineered specifically for Cummins QSB6.7 engines, ensuring proper fitment and compatibility with factory fuel system components. Its proper function is essential for dependable engine operation and long-term reliability.
A failing fuel injector can quickly affect how your engine runs. Because injectors control precise fuel delivery, even a small issue can lead to misfires, rough operation, or poor combustion.
The first step is identifying the symptoms.
Common signs of injector trouble include:
- Rough idle or engine shaking
- Misfires under load
- Hard starting or extended cranking
- Strong fuel odor
- Excessive exhaust smoke
- Decreased fuel efficiency
- Check engine light with injector-related codes
If you notice these symptoms, avoid ignoring them. Continuing to drive with a faulty injector can cause additional engine damage, especially if fuel is leaking into a cylinder.
Next, schedule a professional diagnostic inspection. A technician will typically:
- Perform injector balance testing
- Check fuel pressure
- Scan for diagnostic trouble codes
- Inspect for leaks or contamination
In some cases, clogged injectors may be cleaned if caught early. However, if the injector is leaking, electrically damaged, or severely restricted, replacement is usually required.
It’s also important to address the root cause, such as contaminated fuel or a failing fuel filter.
Acting quickly helps protect pistons, valves, and other critical engine components while restoring smooth engine operation.
The Cummins 5579334 Fuel Injector precisely delivers fuel into the engine combustion chamber.
Yes, the Cummins 5579334 Fuel Injector is engineered to match the original specification for direct installation.
The Cummins 5579334 Fuel Injector installs directly into the cylinder head on the engine’s fuel rail.
Common symptoms include rough idle, misfires, or engine diagnostic codes related to fuel delivery.



















































