
Cummins QSF4.5, ISF4.5 Fuel Injector 2021-2024: OEM 5364543
CUMMINS QSF4.5, ISF4.5 FUEL INJECTOR 2021-2024: OEM 5364543

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx Fuel Injector, Tamerx part number 5364543RM ( OEM Part Number 5364543 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins QSF4.5, ISF4.5, production years 2021-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 5364543 |
| Additional OEM | 5364543 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490537972 |
| WEIGHT | 1.00 LBS |
SHIPPING OPTIONS
Ship Weight : 1.00 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.
Applicable to 2021–2024 Cummins QSF4.5 and ISF4.5 engine platforms, the OEM 5364543 Fuel Injector is manufactured to meet original equipment specifications for accurate fit and consistent operation. This injector precisely meters and atomizes fuel within the combustion chamber, supporting proper timing and controlled fuel delivery. Built to handle the high pressures of modern common rail systems, it features durable internal components designed for demanding diesel environments. Proper injector function is essential for maintaining smooth engine operation and regulated emissions output. Tamerx Diesel Products LLC supplies this Cummins fuel injector as a dependable solution for reliable fuel system function.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2021 | Cummins | QSF4.5 | ISF4.5 | |||
| 2022 | Cummins | QSF4.5 | ISF4.5 | |||
| 2023 | Cummins | QSF4.5 | ISF4.5 | |||
| 2024 | Cummins | QSF4.5 | ISF4.5 | |||
PEOPLE ALSO ASKS | BLOG(S)
In modern diesel engines like the Cummins QSF4.5 and ISF4.5, precise fuel delivery is critical to proper combustion. The Cummins OEM 5364543 Fuel Injector is designed specifically for 2021–2024 applications and plays a central role in controlling how fuel enters the engine.
The primary function of this fuel injector is to deliver a carefully measured amount of diesel fuel into each cylinder at the exact moment required. This precise timing and metering allow the fuel to mix efficiently with compressed air, resulting in controlled combustion.
The Cummins QSF4.5 and ISF4.5 Fuel Injector OEM 5364543 is responsible for:
- Metering the correct quantity of fuel per combustion cycle
- Injecting fuel at precise timing intervals
- Creating a fine spray pattern for efficient atomization
- Supporting emissions compliance requirements
- Communicating with the engine control module (ECM)
Modern injectors are electronically controlled, meaning they respond instantly to signals from the ECM. This allows the engine to adjust fuel delivery based on load, speed, and operating conditions.
A properly functioning OEM 5364543 fuel injector helps maintain smooth idle, consistent combustion, and dependable engine operation. As a direct-fit component built to factory specifications, it ensures compatibility with Cummins QSF4.5 and ISF4.5 engines used in 2021–2024 equipment and vehicle applications.
Fuel injectors are designed to deliver precise amounts of fuel into the engine at extremely high pressure. When they fail, engine operation can quickly become rough and unreliable.
The main cause of fuel injector failure is contamination within the fuel system.
Even tiny particles of dirt, rust, or debris can clog the injector’s microscopic nozzle openings. Once restricted, the spray pattern becomes uneven, leading to poor combustion, misfires, or rough idle.
Several factors commonly contribute to injector contamination:
- Low-quality or contaminated fuel
- A clogged or overdue fuel filter
- Water in the fuel system
- Rust inside the fuel tank
- Running the vehicle consistently on very low fuel
Modern injectors operate with tight tolerances. Because of this, even small amounts of buildup can interfere with proper fuel delivery. Over time, carbon deposits can also form on the nozzle tip, further disrupting the spray pattern.
In addition to contamination, normal wear of internal seals and electrical components can eventually lead to failure, especially in high-mileage engines.
Routine fuel filter changes, draining water separators in diesel systems, and using clean fuel from reputable sources can significantly reduce the risk of injector problems and help maintain consistent engine operation.
The 5364543 injector mounts in the cylinder head to deliver fuel into each combustion chamber.
The 5364543 fuel injector is engineered for direct fitment on compatible QSF4.5 and ISF4.5 engines.
Verifying OEM 5364543 ensures the correct injector is selected for the specified engine applications.
Issues such as uneven firing or diagnostic codes related to fuel delivery may indicate injector concerns.




















































