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Cummins ISL Fuel Pump Adapter 2008-2011: OEM 4921433RX

CUMMINS ISL FUEL PUMP ADAPTER 2008-2011: OEM 4921433RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$609.00

CORE CHARGE:

$100.00
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 NUMBER4921433RX
PART TYPEFuel Pump Adapter
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR2008-2011
PART NUMBER4921433RM

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Fuel Pump Adapter, Tamerx part number 4921433RM ( OEM Part Number 4921433RX ). 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 ISL, production years 2008-2011, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4921433RX
Additional OEM4921433RX

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490543133
WEIGHT1.00 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.


Enhance fuel system performance with this OEM 4921433RX fuel pump adapter for 2008–2011 Cummins ISL engines. Designed for a precise fit and reliable operation, it ensures proper alignment and secure connection of your fuel pump for smooth, efficient delivery. Built to OEM standards for durability and long-lasting performance, it’s the dependable choice for maintaining your ISL’s fuel system integrity.

FITMENT CHART

YEARMAKEENGINE(S)
2008Cummins ISL
2009Cummins ISL
2010Cummins ISL
2011Cummins ISL

PEOPLE ALSO ASKS | BLOG(S)

In a diesel engine, every link in the fuel delivery chain must work perfectly to maintain reliable performance — and the Cummins ISL Fuel Pump Adapter (2008–2011, OEM 4921433RX) plays a critical role in that chain. Designed specifically for Cummins ISL engines from model years 2008 to 2011, this adapter provides the secure and accurate connection between the fuel pump and engine, ensuring the system delivers fuel precisely where it’s needed. Choosing the correct OEM-grade adapter helps support efficient operation and long-term durability of your fuel system.

This fuel pump adapter is key to keeping your engine’s fuel delivery system working smoothly — here’s how it supports performance:

  • Ensures Proper Fuel Pump Alignment – Provides a precise connection that keeps the fuel pump correctly positioned, promoting smooth fuel flow and preventing leaks or misalignment issues.

  • Supports Efficient Fuel Delivery – By securing the pump in the right orientation, the adapter helps maintain consistent flow rates, contributing to efficient combustion and responsive performance.

  • Prevents Fuel System Issues – A correct adapter can reduce the risk of pump vibration, premature wear, and poor sealing — all of which can lead to fuel delivery problems if left unaddressed.

  • OEM-Grade Fit and Reliability – As OEM 4921433RX, this adapter meets original manufacturer specifications, ensuring proper fit, reliable connection, and long-lasting performance in demanding conditions.

  • Simple and Secure Installation – Designed to match factory tolerances, the adapter makes installation straightforward while helping prevent loosening or misalignment over time.

Replacing a worn or incorrect fuel pump adapter is a smart way to protect your engine’s fuel delivery system and maintain optimal performance. The Cummins ISL Fuel Pump Adapter (OEM 4921433RX) delivers the OEM-certified fit and quality needed for stable fuel system operation and dependable engine response. For customers seeking durable, high-quality replacement components, Tamerx provides trusted parts designed to help your diesel engine run smoothly and reliably.

Selecting the correct fuel pump adapter is essential for ensuring proper fuel delivery, maintaining system pressure, and preventing leaks or performance issues. Because different vehicles and fuel systems require specific adapter sizes, materials, and configurations, choosing the right one can feel overwhelming. Understanding the key factors makes the process much easier and ensures a proper fit for your fuel system.

Key Factors to Consider When Choosing a Fuel Pump Adapter

  • Match the Adapter to Your Vehicle Model
    Always start by verifying compatibility with your vehicle’s year, make, and model. Using the wrong adapter can cause fitment issues or leaks.

  • Check Fuel System Type
    Different systems—returnless, high-pressure, diesel, or gasoline—may require specific adapter styles or fittings.

  • Material Quality
    Choose adapters made from durable, corrosion-resistant materials such as aluminum or stainless steel to ensure long-term reliability.

  • Thread Size and Connection Style
    Confirm the thread pitch, diameter, and connection type (AN, NPT, OEM-specific) to avoid mismatched fittings.

  • Pressure Rating Requirements
    Ensure the adapter can withstand your vehicle’s fuel pressure specifications, especially in high-performance or diesel applications.

  • OEM vs. Aftermarket Options
    OEM adapters offer guaranteed compatibility, while aftermarket options may provide cost savings—just ensure they meet quality standards.

Choosing the right fuel pump adapter comes down to compatibility, quality, and proper pressure handling. By matching the adapter to your vehicle specifications and ensuring durable materials and correct thread sizes, you can maintain a reliable, leak-free fuel system. A little research upfront helps prevent installation issues and keeps your vehicle running smoothly.

Using an incorrect adapter can cause misalignment, fuel leaks, poor fuel pressure, premature pump wear, or complete fuel delivery failure.

Look for signs of fuel leaks around the pump area, loose fittings, abnormal fuel pressure, or visible damage to the adapter.

It doesn’t wear quickly like filters or injectors, but heat, corrosion, vibration, or improper installation can cause it to fail over time.

Yes — if it doesn’t fit tightly or seals improperly, it can allow fuel leaks or incorrect pressure delivery to the pump and engine.

Cummins Fuel Pump Adapters

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