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Cummins ISX12 High Pressure Fuel Pump 2014-2017: OEM 5491786RX

CUMMINS ISX12 HIGH PRESSURE FUEL PUMP 2014-2017: OEM 5491786RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$5,250.00

CORE CHARGE:

$1,200.00
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 NUMBER5491786RX
PART TYPEHigh Pressure Fuel Pump
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISX12
YEAR2014-2017
PART NUMBER5491786RM

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx High Pressure Fuel Pump, Tamerx part number 5491786RM ( OEM Part Number 5491786RX ).This part is primarily made for a Cummins ISX12, production years 2014-2017, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5491786RX
Additional OEM5491786, 549178600PX, 5491786PX, 5491786RX

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490547827
WEIGHT75.00 LBS

SHIPPING OPTIONS

Ship Weight : 75.00 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.


Power up your Cummins ISX12 with the Cummins ISX12 High Pressure Fuel Pump 2014–2017 – OEM 5491786RX, the upgrade your fuel system has been waiting for. Engineered to deliver consistent, high-pressure fuel flow, this pump helps boost efficiency and reliability when the road gets tough. Built to strict OEM standards for a perfect fit and long-lasting performance, it’s the dependable heart of your engine’s fuel delivery. Stay fueled for every mile with performance you can count on.

FITMENT CHART

YEARMAKEENGINE(S)
2014Cummins ISX12
2015Cummins ISX12
2016Cummins ISX12
2017Cummins ISX12

PEOPLE ALSO ASKS | BLOG(S)

A high-pressure fuel pump is a crucial part of a diesel engine’s fuel system, responsible for delivering pressurized fuel to the injectors so the engine can achieve efficient combustion. The Cummins ISX12 High Pressure Fuel Pump (2014–2017, OEM 5491786RX) is engineered to meet original manufacturer standards, ensuring consistent fuel supply, responsive performance, and reliable engine operation. Choosing the correct OEM fuel pump helps maintain overall engine health, fuel efficiency, and dependable power delivery across varying conditions.

This high-pressure fuel pump plays a key role in your engine’s performance — here’s why it matters:

  • Delivers Pressurized Fuel to Injectors – Supplies the precise fuel pressure needed for injectors to atomize fuel effectively, promoting complete combustion and smoother operation.

  • Supports Engine Responsiveness – A stable fuel supply helps maintain throttle response and consistent power under load, reducing hesitation or sluggish behavior.

  • Enhances Fuel Efficiency – Correct fuel pressure and delivery contribute to efficient combustion, helping reduce fuel waste and improve economy.

  • OEM-Grade Fit and Reliability – As OEM 5491786RX, this fuel pump meets factory specifications for fitment and performance, ensuring long-lasting durability and dependable operation.

  • Prevents Fuel System Problems – Replacing a worn or failing pump can help avoid common issues such as hard starts, rough idle, loss of power, or excessive smoke.

A failing high-pressure fuel pump can lead to reduced engine performance, uneven combustion, and higher fuel consumption. The Cummins ISX12 High Pressure Fuel Pump (OEM 5491786RX) delivers the precision and OEM-standard quality your engine depends on — helping maintain smooth, efficient, and reliable operation. For customers seeking a trusted replacement component, Tamerx offers high-quality fuel system parts designed to support long-term engine health and performance.

 

A high-pressure fuel pump is responsible for delivering fuel at the exact pressure needed for proper engine operation. When this component begins to fail, it can quickly affect drivability and engine reliability. While it may be possible to drive for a short time, continuing to operate a vehicle with a failing high-pressure fuel pump carries significant risks.

  • Hard starting or stalling: Inconsistent fuel pressure can make the engine difficult to start or cause it to shut off unexpectedly.

  • Loss of power: A failing pump may not supply enough fuel under load, leading to hesitation or reduced acceleration.

  • Rough engine operation: Fluctuating fuel pressure can cause misfires or uneven running.

  • Dashboard warning lights: Check engine lights or fuel pressure-related fault codes often appear as pump issues worsen.

  • Risk of internal damage: Metal debris from a failing pump can contaminate the fuel system and damage injectors and fuel rails.

  • Unexpected breakdowns: Complete pump failure can leave the vehicle unable to run at all.

Driving with a failing high-pressure fuel pump is not recommended, even if symptoms seem minor at first. Addressing the issue early helps prevent fuel system contamination, reduces repair costs, and supports safe, dependable vehicle operation.

Regularly changing the fuel filter and ensuring the fuel system stays free of contamination helps protect the pump’s internal components. Routine system checks also help catch early issues before they worsen.

Yes, if the pump cannot maintain correct fuel pressure, the engine’s control unit may detect irregularities and trigger warning lights or fault codes. These alerts indicate it’s time for further inspection.

Cold temperatures can make diesel fuel thicker, which can increase the workload on the pump during engine starts. Using winter-grade fuel and allowing warm-up time can help reduce stress on the pump.

Yes, operating with a failing fuel pump can lead to poor combustion, increased wear on injectors, and potential engine misfires. Promptly addressing fuel pump issues helps avoid costly repairs.

Cummins High Pressure Fuel Pumps

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