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Cummins QSB 5.9L Fuel Injector 2003-2007: OEM 5263317 ( Set of 6 )

CUMMINS QSB 5.9L FUEL INJECTOR 2003-2007: OEM 5263317 ( SET OF 6 )

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$3,570.00

CORE CHARGE:

$900.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER5263317
PART TYPEFuel Injector
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB 5.9L
YEAR2003-2007
PART NUMBER0 445 120 254-SET
APPLICATION NOTESMarine

PRODUCT DESCRIPTION

This is a Genuine New, Tamerx Fuel Injector, Tamerx part number 0 445 120 254-SET ( OEM Part Number 5263317 ).This part is primarily made for a Cummins QSB 5.9L, production years 2003-2007, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5263317
Additional OEM3968846, 5254682, 5263317

ADDITIONAL DETAILS

CONDITIONGenuine New
UPC / Barcode
WEIGHT12.00 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.


Drive consistent performance with the Cummins QSB 5.9L Fuel Injector Set (2003–2007): OEM 5263317 (Set of 6). These genuine OEM injectors are engineered for accurate fuel delivery, clean combustion, and dependable efficiency—perfect for handling tough jobs without hesitation. Built for durability and a precision fit, this set gives your QSB 5.9L engine the support it needs to run smooth, strong, and efficient in any environment.

FITMENT CHART

YEARMAKEENGINE(S)
2003Cummins QSB 5.9L
2004Cummins QSB 5.9L
2005Cummins QSB 5.9L
2006Cummins QSB 5.9L
2007Cummins QSB 5.9L

PEOPLE ALSO ASKS | BLOG(S)

The Cummins QSB 5.9L Fuel Injector is a key part of the engine’s fuel delivery system, designed to ensure precise fuel injection for optimal combustion. For the 2003-2007 models, the OEM 5263317 injectors are engineered to meet strict standards, ensuring reliability and efficiency.

Key Components of the Fuel Injector

Each fuel injector in the set features several critical components that work together to provide accurate fuel delivery:

  • Nozzle
    • The nozzle is responsible for atomizing fuel into fine particles for effective combustion.
  • Solenoid Valve
    • This controls the timing and amount of fuel injected into the combustion chamber.
  • Fuel Inlet
    • Allows fuel to flow into the injector for precise delivery.
  • Internal Spring
    • Maintains the pressure balance needed for proper injector function.
  • Body Assembly
    • Houses all components and ensures structural integrity.

Why Proper Components Matter

Each component of the Cummins QSB 5.9L fuel injector is carefully designed to handle high pressures and maintain consistent fuel delivery. If any part becomes worn or damaged, it can lead to issues such as rough idling, difficulty starting, or excessive fuel consumption.

Fuel injectors are crucial for the efficient operation of your diesel engine, ensuring optimal fuel delivery. Knowing when to replace them can save you from costly repairs and maintain your engine's health.

Identifying the Need for Replacement

Fuel injectors don't have a one-size-fits-all lifespan, and their longevity can be influenced by various factors including fuel quality and engine condition. Typically, it's advisable to assess fuel injectors for potential replacement during major engine check-ups.

  • Mileage Check
    • Generally, fuel injectors should be inspected every 60,000 to 90,000 miles.
  • Symptoms of Wear
    • Look out for signs like poor idle, reduced economy, and starting issues, which can signal that your injectors might need attention.
  • Regular Maintenance
    • Regular checks during scheduled services can help spot early signs that injectors are wearing out.

Proactive Replacement Benefits

Replacing your fuel injectors at the right time is crucial for maintaining your engine’s efficiency and longevity. Waiting until you experience engine problems can lead to more extensive repairs.

Ensure your diesel engine remains in top condition by keeping an eye on the health of your fuel injectors. Regular maintenance and timely replacement are key to avoiding engine troubles down the road.

Yes, inadequate fuel injection can make it difficult for the engine to start, especially when cold.

The engine may misfire or run unevenly, compromising power and fuel economy.

While fuel additives can provide basic cleaning, thorough restoration requires professional servicing.

Uniform spray ensures even combustion, which improves engine stability and reduces emissions.

 

Cummins Fuel Injectors