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Caterpillar C7.1 Fuel Injector 2010-2021: OEM 20R5078

CATERPILLAR C7.1 FUEL INJECTOR 2010-2021: OEM 20R5078

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$695.00

CORE CHARGE:

$250.00
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 NUMBER20R5078
PART TYPEFuel Injector
BRANDTamerx Diesel Products
ENGINE MAKECaterpillar
ENGINE TYPEC7.1
YEAR2010-2021
PART NUMBER20R5078RM

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Fuel Injector, Tamerx part number 20R5078RM ( OEM Part Number 20R5078 ). 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 Caterpillar C7.1, production years 2010-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM20R5078
Additional OEM20R5078, 294-3027, 456-3545

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490547940
WEIGHT4.00 LBS

SHIPPING OPTIONS

Ship Weight : 4.00 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.


Revitalize your Cat C7.1 with the Caterpillar C7.1 Fuel Injector 2010–2021 – OEM 20R5078, designed to deliver precise fuel flow for optimal combustion. This high-quality injector helps improve throttle response and maintain engine efficiency under all kinds of load. Built to OEM standards for a direct fit and lasting performance, it’s a dependable replacement you can trust. Keep your engine firing strong and your rig running smooth mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2010Caterpillar C7.1
2011Caterpillar C7.1
2012Caterpillar C7.1
2013Caterpillar C7.1
2014Caterpillar C7.1
2015Caterpillar C7.1
2016Caterpillar C7.1
2017Caterpillar C7.1
2018Caterpillar C7.1
2019Caterpillar C7.1
2020Caterpillar C7.1
2021Caterpillar C7.1

PEOPLE ALSO ASKS | BLOG(S)

Fuel injectors are a vital part of a diesel engine’s fuel system, responsible for delivering the precise amount of fuel to the combustion chamber at the right moment. The Caterpillar C7.1 Fuel Injector (2010–2021, OEM 20R5078) is engineered to meet original equipment specifications, ensuring consistent fuel delivery and helping maintain smooth engine operation. Choosing the correct OEM-grade injector helps support efficient combustion, fuel economy, and long-term engine health for Caterpillar C7.1 engines over a decade of service.

This fuel injector directly influences how your engine performs — here’s why it matters:

  • Precise Fuel Delivery – Supplies the exact amount of fuel needed for efficient combustion, contributing to smooth engine operation.

  • Supports Stable Engine Behavior – Consistent injector performance helps reduce rough idling, misfires, hard starting, and uneven power delivery.

  • Improves Fuel Efficiency – Accurate fuel atomization and timing contribute to better fuel economy and cleaner combustion results.

  • OEM-Grade Fit and Durability – As OEM 20R5078, this injector matches factory standards for fitment, spray pattern, and long-lasting reliability.

  • Prevents Fuel System Issues – Replacing worn or malfunctioning injectors helps avoid symptoms like excessive smoke, poor throttle response, and premature wear.

A reliable fuel injector is essential for smooth, efficient, and dependable diesel engine operation. The Caterpillar C7.1 Fuel Injector (OEM 20R5078) delivers the precision and OEM-standard quality your engine depends on — helping maintain consistent combustion, steady performance, and long-term reliability. For customers seeking a trustworthy replacement part, Tamerx offers high-quality components designed to support strong engine health and enduring performance.

Fuel injectors play a key role in delivering the correct amount of fuel to the engine for proper combustion. When an injector becomes faulty, engine performance and reliability can quickly be affected. While a vehicle may still run with a bad fuel injector, continuing to drive can lead to additional engine and fuel system problems.

  • Rough idle or misfires: A faulty injector can cause uneven fuel delivery, leading to shaking or misfiring.

  • Loss of power: Improper fuel spray or reduced flow can affect acceleration and overall engine response.

  • Poor fuel efficiency: Leaking or clogged injectors may cause excessive fuel consumption.

  • Check engine light activation: Fault codes related to misfires or fuel delivery often appear.

  • Increased emissions: Incomplete combustion can lead to higher exhaust emissions and emissions system issues.

  • Risk of engine damage: Continued driving may damage pistons, valves, or the catalytic components.

Driving with a faulty fuel injector is not recommended, even if the vehicle remains operable. Addressing injector issues early helps prevent costly repairs, maintains reliable engine operation, and supports overall vehicle longevity.

Common signs include rough idling, loss of power, or hard starting. Increased smoke or misfires can also indicate that fuel is not being atomized correctly.

Yes, when the Caterpillar C7.1 Fuel Injector 2010–2021: OEM 20R5078 is operating correctly and delivering fuel accurately, it helps maintain efficient fuel usage. A worn injector can cause poor combustion and increased fuel consumption.

Using clean diesel fuel and changing fuel filters on schedule helps keep contaminants away from the injector. Regularly serviced fuel systems help extend injector life.

Yes, the engine’s diagnostic system may detect poor combustion or pressure issues and illuminate a warning light. Fault codes can help identify injector-related problems.

 

Caterpillar Fuel Injectors

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