Cummins QSK Series Fuel Injectors | 11+ Part Numbers, Bench-Tested & 12-Month Warranty for Mining, Marine & Power Generation

Professional QSK45, QSK60 & QSK78 Diesel Fuel Injector Supply

We supply fuel injectors for selected Cummins QSK-series diesel engines used in mining trucks, heavy-duty off-highway equipment, marine engines, generator sets and industrial power systems.

Our focus is not simply supplying an injector by part number. As a professional diesel fuel-system supplier, we help repair workshops and maintenance companies verify the injector part number, engine model, application, fuel-system configuration and replacement requirements before shipment.

Our QSK injector range covers multiple part numbers for QSK19, QSK23, QSK45, QSK60, QSK78 and related applications. Depending on the specific part number and engine configuration, the injector may belong to different fuel-system designs, including electronic unit injector and common-rail/HPI/MCR-related applications.

We offer new aftermarket and professionally remanufactured injectors, with pre-delivery inspection and applicable bench testing. For wholesale customers, we also provide mixed part-number orders, neutral export packaging, technical matching support and international logistics.

For repair workshops, our priority is to help you receive the correct injector for the actual engine application, rather than simply matching a similar-looking component.

Why Repair Shops Choose Our QSK Injectors

1. 11+ QSK Injector Part Numbers Available

Our QSK-series product range covers multiple commonly requested injector numbers, including:

• 4088431

• 4326639

• 4326779

• 4326780

• 4326781

• 4902827

• 4902828

• 4921360

• 4923349

• 4928345

• 4954801

Availability depends on current stock and production schedule.

2. New & Remanufactured Options

We provide both new and remanufactured injector options for professional diesel repair applications.

This allows repair workshops to select a solution according to engine condition, repair budget and project requirements.

3. Professional Bench Testing

Before shipment, our technicians perform applicable injector testing according to the product type.

Depending on the injector model, our testing can include:

• Fuel delivery quantity

• Return/leak-off quantity

• Injection response

• Electrical response

• Spray condition where applicable

• Opening/injection characteristics

• Test-data consistency

We do not consider an injector ready for shipment simply because it looks good externally.

4. Technical Part-Number Matching

We understand that QSK engines have different fuel-system configurations.

Therefore, we recommend that repair shops provide the complete injector part number, engine model and engine serial number whenever possible.

This is particularly important when an older injector has been superseded, replaced or used on different engine configurations.

5. 12-Month Warranty

We provide a 12-month warranty for qualifying injector orders according to our agreed warranty terms.

We also provide technical communication during the purchasing process to help customers confirm the correct application before shipment.

QSK Fuel Injector Applications

Our injector products are mainly supplied for professional applications such as:

Mining Equipment

• Mining haul trucks

• Open-pit mining equipment

• Large excavators

• Heavy-duty loaders

• Mining power systems

Marine Applications

• Marine propulsion engines

• Commercial vessels

• Offshore equipment

• Marine auxiliary engines

Power Generation

• Large diesel generator sets

• Prime-power generator systems

• Standby power systems

• Industrial power-generation equipment

Heavy Industrial Equipment

• Industrial diesel engines

• Heavy construction machinery

• Stationary engines

• High-load continuous-duty equipment

Cummins identifies QSK60 as a large-bore diesel engine platform used in demanding applications, and its official documentation includes 24V starting systems and direct-injection fuel-system specifications for certain QSK60 generator configurations.

Our QSK Injector Testing Process

As an engineering-oriented supplier, we treat fuel-injector quality as a testing issue rather than simply a visual inspection issue.

Our standard workflow is:

Step 1 — Part Number Verification

We first check:

• Injector part number

• Cross-reference number

• Product type

• Engine family

• Application information

This helps prevent incorrect part-number matching.

Step 2 — Visual & Mechanical Inspection

We inspect the injector body, nozzle area, connectors, sealing surfaces and other external components.

We look for:

• Physical damage

• Corrosion

• Abnormal wear

• Contamination

• Damaged threads

• Damaged electrical connections

• Abnormal sealing surfaces

Step 3 — Cleaning

For applicable remanufactured units, we perform professional cleaning before further inspection.

Fuel-system components must be handled in a controlled and clean environment because contamination can directly affect injector performance.

Step 4 — Internal Component Inspection

For remanufacturing, we inspect the relevant internal components and identify parts that require replacement.

Components that do not meet our internal inspection requirements are not reused simply to reduce cost.

Step 5 — Calibration & Bench Testing

The injector is installed on the applicable test equipment.

Depending on the injector type, we evaluate relevant parameters such as:

• Injection quantity

• Return quantity

• Idle quantity

• Full-load delivery

• Injection response

• Electrical signal

• Spray performance

• Test-data stability

The exact test procedure and acceptance values depend on the injector model and applicable test specification.

Step 6 — Final Inspection

After testing, we perform final inspection of:

• Part number

• Physical condition

• Test result

• Sealing components

• Packaging

• Customer order information

Step 7 — Export Packaging

The injector is then protected using suitable export packaging for international transportation.

Neutral packaging and customized packaging can be discussed for wholesale orders.

Important: EUI, HPI and Common-Rail Injector Identification

One of the most important things we explain to repair shops is that not every QSK injector uses the same fuel-system architecture.

Some QSK applications use electronic unit injector technology, while other engine generations and configurations use high-pressure or modular common-rail fuel systems.

For example, Cummins describes the QSK60 HPI-to-MCRS upgrade as a conversion to its Modular Common Rail Fuel System (MCRS), including ultra-fast actuated injectors, high-pressure fuel lines, a dual-stage high-pressure fuel pump and an engine control module.

This means that an injector should not be selected only because the engine name says “QSK60”.

We recommend checking:

Injector Part Number → Engine Model → ESN → Fuel-System Configuration → Application

This is one of the reasons we ask professional repair customers to send us the injector label or engine information before ordering.

QSK Injector Symptoms We Commonly See in Repair Work

A worn or defective fuel injector can contribute to a range of engine symptoms.

Depending on the engine and failure mode, repair technicians may encounter:

• Hard starting

• Difficult cold starting

• Rough idle

• Uneven cylinder contribution

• Engine misfire

• Loss of power

• Increased fuel consumption

• Excessive exhaust smoke

• Abnormal combustion

• Fuel leakage

• Injector-related diagnostic fault codes

However, these symptoms do not automatically prove that the injector is defective.

Similar symptoms can also be caused by:

• Fuel contamination

• Fuel-filter restriction

• High-pressure fuel-pump problems

• Wiring faults

• ECM/ECU problems

• Fuel-pressure problems

• Sensor faults

• Mechanical engine problems

For this reason, we recommend testing the injector and checking the complete fuel system before replacing expensive components.

Injector Calibration and Coding

For some electronically controlled diesel fuel systems, injector-specific calibration information may be required.

The exact procedure depends on the engine and control system.

If your application requires an injector calibration code or electronic compensation value, our technicians will confirm the requirement based on the specific injector and engine configuration.

We do not recommend assuming that every QSK injector uses the same coding procedure.

For workshop customers, please provide:

• Engine model

• Engine serial number

• Injector part number

• Existing injector information

• ECM/ECU model where available

We can then confirm whether calibration data or coding is required before installation.

QSK Fuel Injector Product Range

Below is our current product-range structure for the QSK injector products you provided.

Application note: The information below is intended for product-page and sourcing reference. Final compatibility should be confirmed against the actual engine configuration and serial number.

1. Cummins 4088431 Fuel Injector | 10-Hole Heavy-Duty Design, QSK45/QSK60/QSK78 Applications

Part Number: 4088431
Cross References: 4088430, 4954800
Engine Applications: Selected QSK45 / QSK60 / QSK78 applications
Typical Applications: Mining trucks, marine engines, power-generation equipment
Product Options: New / Remanufactured
Warranty: 12 months

We supply 4088431 injectors for selected QSK-series applications. This part number is listed in multiple QSK injector catalogs for QSK23/QSK45/QSK60-related applications, so we recommend confirming the exact engine configuration before shipment.

2. Cummins 4326639 Fuel Injector | QSK23/QSK45/QSK60 Support, Bench-Tested & 12-Month Warranty

Part Number: 4326639
Cross Reference: 4001813
Engine Applications: Selected QSK23 / QSK45 / QSK60 applications
Typical Applications: Mining equipment, marine engines, generator sets
Product Options: New / Remanufactured
Warranty: 12 months

We supply 4326639 injectors for selected QSK applications. Public QSK injector catalogs list 4326639 among QSK23/QSK45/QSK60-related injector part numbers.

3. Cummins 4326779 Fuel Injector | QSK45/QSK60 Heavy-Duty Replacement, Tested & Remanufactured Options

Part Number: 4326779
Cross References: 4326778, 4307516
Engine Applications: Selected QSK45 / QSK60 applications
Applications: Mining equipment, marine diesel engines, industrial machinery
Condition: New / Remanufactured
Warranty: 12 months

We supply 4326779 as part of our QSK-series injector range. Before ordering, repair shops should verify the complete engine configuration and existing injector number.

4. Cummins 4326780 Fuel Injector | 8-Hole QSK45/QSK60 Replacement, Bench Tested & 12-Month Warranty

Part Number: 4326780
Cross References: 4326781, 4001813
Engine Applications: Selected QSK45 / QSK60 applications
Typical Applications: Mining trucks, marine engines, generator sets
Condition: New / Remanufactured
Warranty: 12 months

The 4326780 injector is commonly listed within QSK45/QSK60 injector ranges. Related part numbers including 4326780 and 4326781 appear in QSK injector catalogs.

5. Cummins 4326781 Fuel Injector | 8-Hole QSK60 Replacement, Tested & Wholesale Ready

Part Number: 4326781
Cross References: 4326780, 4001813
Engine Applications: Selected QSK45 / QSK60 applications
Applications: Construction machinery, mining equipment, marine engines
Condition: New / Remanufactured
Warranty: 12 months

We provide 4326781 as a professional replacement option for selected QSK applications.

For repair workshops, we recommend comparing the old injector label and engine information before ordering rather than relying only on the engine family name.

6. Cummins 4902827 Fuel Injector | QSK23/QSK60 Replacement, Bench Tested & 12-Month Warranty

Part Number: 4902827
Cross References: 4902828, 4062090
Engine Applications: Selected QSK23 / QSK60 applications
Applications: Construction equipment, generator sets, marine equipment
Condition: New / Remanufactured
Warranty: 12 months

4902827 is listed in aftermarket and QSK-series injector sources for QSK60 applications. Independent injector testing procedures commonly include full-load quantity, return quantity, idle quantity, pre-injection and starting-injection checks.

This is exactly the type of testing approach we recommend before installing an injector in a high-value diesel engine.

7. Cummins 4902828 Fuel Injector | QSK19/QSK45/QSK60 Applications, Tested & Ready for Wholesale

Part Number: 4902828
Cross References: 4902827, 4062091
Engine Applications: Selected QSK19 / QSK45 / QSK60 applications
Typical Applications: Construction machinery, mining equipment, generator sets
Condition: New / Remanufactured
Warranty: 12 months

We supply 4902828 for selected QSK applications and recommend confirming the actual engine serial number before ordering.

8. Cummins 4921360 Fuel Injector | 8-Hole QSK60 Replacement, Bench Tested & 12-Month Warranty

Part Number: 4921360
Cross References: 4921361, 4002145
Engine Applications: Selected QSK60 applications
Applications: Large mining equipment, marine engines, power-generation systems
Condition: New / Remanufactured
Warranty: 12 months

The 4921360 part number is listed among QSK injector products for QSK23/QSK45/QSK60 applications in public injector catalogs.

9. Cummins 4923349 Fuel Injector | QSK60 Heavy-Duty Replacement, Tested & Wholesale Supply

Part Number: 4923349
Cross References: 4923348, 4010025
Engine Applications: Selected QSK60 applications
Applications: Mining machinery, marine diesel engines, industrial equipment
Condition: New / Remanufactured
Warranty: 12 months

We supply 4923349 for selected QSK60 applications and support both repair-shop orders and distributor purchasing.

10. Cummins 4928345 Fuel Injector | QSK60 Heavy-Duty EUI Replacement, Tested & 12-Month Warranty

Part Number: 4928345
Cross References: 4928344, 4010029
Engine Applications: Selected QSK60 applications
Applications: Mining equipment, generator sets, marine propulsion and industrial machinery
Condition: New / Remanufactured
Warranty: 12 months

Public technical and aftermarket sources list 4928345 within QSK60 injector ranges and associate it with electronic unit injector applications.

We recommend matching the injector against the engine configuration rather than assuming that every QSK60 uses the same injector.

11. Cummins 4954801 Fuel Injector | HPI QSK45/QSK60/QSK78 Replacement, Tested & 12-Month Warranty

Part Number: 4954801
Cross References: 4954800, 4088431
Engine Applications: Selected QSK45 / QSK60 / QSK78 applications
Applications: Mining trucks, marine engines, power-generation equipment
Condition: New / Remanufactured
Warranty: 12 months

Important technical correction: We recommend describing 4954801 as a QSK HPI injector rather than calling it an ISX11.9/ISX12/QSX11.9 XPI injector on this product page. Public parts references identify 4954801 as an HPI QSK injector, and other QSK injector catalogs list it with QSK23/QSK45/QSK60 applications.

This correction is important because a professional mining or engine-repair buyer may immediately recognize the difference between an ISX XPI application and a QSK HPI application.

New vs. Remanufactured QSK Injectors

We offer two main quality options depending on availability and customer requirements.

New Injector

Our new injector option is suitable for customers who prefer a new replacement component for engine repair or overhaul.

Before shipment, we still recommend verifying:

• Part number

• Engine model

• Engine serial number

• Fuel-system configuration

• Application

Remanufactured Injector

Our remanufactured injectors are processed through a controlled inspection and testing workflow.

The process can include:

• Core inspection

• Disassembly

• Professional cleaning

• Component inspection

• Replacement of failed components

• Reassembly

• Calibration

• Bench testing

• Final inspection

The purpose of remanufacturing is not simply to make a used injector look new. Our objective is to restore the injector to an acceptable functional condition for the confirmed application.

Fuel Injector Installation Advice for Repair Workshops

When installing a replacement injector, we recommend checking the complete fuel system rather than changing the injector alone.

Before installation, inspect:

Fuel Cleanliness

Contaminated fuel can damage a newly installed injector.

Check:

• Fuel filters

• Fuel lines

• Fuel tank contamination

• Water contamination

• Metal particles

Sealing Components

Use the correct sealing components for the specific injector and engine.

Incorrect or damaged sealing components can cause leakage or installation problems.

Electrical Connections

For electronically controlled injectors, inspect the connector and wiring harness.

Look for:

• Loose terminals

• Corrosion

• Damaged insulation

• Poor electrical contact

• Harness damage

Engine Calibration

If the engine requires injector calibration or compensation data, follow the applicable service procedure.

Post-Installation Testing

After installation, we recommend checking:

• Engine starting

• Idle stability

• Cylinder contribution

• Fuel pressure

• Diagnostic fault codes

• Exhaust smoke

• Engine performance

Why We Recommend Testing the Fuel System Before Injector Replacement

A fuel injector rarely operates independently.

It works together with:

Fuel Tank → Filtration → Fuel Pump → High-Pressure System → Injector → Combustion Chamber → ECM/Control System

If contamination, incorrect fuel pressure or electrical faults exist elsewhere in the system, a new injector may fail prematurely.

For this reason, our technical team recommends that repair shops diagnose the complete fuel system whenever repeated injector failures occur.

This approach can reduce unnecessary parts replacement and repeated workshop labor.

B2B Wholesale Supply

We work with professional customers rather than focusing only on individual retail orders.

Our customers include:

• Mining equipment repair companies

• Mining maintenance contractors

• Marine engine service yards

• Generator repair companies

• Diesel engine overhaul workshops

• Heavy machinery parts distributors

• Diesel fuel-system specialists

• International aftermarket wholesalers

We support:

• Trial orders

• Repeat orders

• Bulk orders

• Mixed part numbers

• Neutral packaging

• Distributor supply

• Project-based procurement

For mixed QSK injector orders, we can discuss the required quantity and available stock before quotation.

Global Export Service

We maintain stock of selected diesel fuel-system products and provide international shipping solutions.

Depending on the order, we can support:

• Express shipment

• Air freight

• Sea freight

• Door-to-door logistics

• Consolidated shipment

Our export service is designed for overseas repair workshops and distributors that need reliable parts availability rather than occasional retail purchasing.

Our One-Stop Diesel Fuel-System Supply

Injectors are only one part of our product range.

We also supply selected:

• Diesel fuel injectors

• Injector nozzles

• High-pressure fuel pumps

• Engine control modules

• ECU/ECM components

• Fuel-system valves

• Related diesel electronic-control components

Our goal is to help repair companies reduce the time spent searching for difficult-to-match components.

Instead of purchasing injectors from one supplier, pumps from another and ECUs from a third supplier, our customers can discuss multiple diesel fuel-system requirements with one technical sales team.

Why Work With Us?

We Focus on Technical Matching

We do not recommend selecting an injector only by appearance.

We check:

Part Number + Engine + Application + Fuel System

We Support New and Remanufactured Parts

This gives repair shops more flexibility when controlling maintenance costs.

We Test Before Shipment

Our applicable injector test procedures focus on fuel delivery, return quantity, electrical response and other relevant parameters.

We Support Mixed Orders

Repair shops and distributors can discuss mixed part-number purchasing according to available stock.

We Provide 12-Month Warranty

Qualifying injector orders are covered by our standard 12-month warranty terms.

We Understand Workshop Problems

Our communication is designed around the real problems faced by diesel repair technicians:

• Wrong part number

• Wrong application

• Poor injector performance

• Repeat failures

• Contaminated fuel systems

• Difficult-to-source parts

• Long delivery times

Our objective is to help solve the entire sourcing problem, not simply sell an individual injector.

QSK Injector Ordering Checklist

Before sending your inquiry, please provide as much of the following information as possible:

1. Injector Part Number

Example:

4954801

2. Engine Model

Example:

QSK60

3. Engine Serial Number

ESN is strongly recommended for application confirmation.

4. Existing Injector Number

A clear photo of the old injector label can be very helpful.

5. Application

Please tell us whether the engine is used in:

• Mining truck

• Excavator

• Generator

• Marine vessel

• Industrial equipment

6. Required Condition

• New

• Remanufactured

7. Quantity

Tell us whether you need:

• 1 piece

• Complete engine set

• Mixed part numbers

• Wholesale quantity

Frequently Asked Questions

Can I install the injector directly without checking the engine number?

We do not recommend this.

Even when two injectors look similar, their fuel-system configuration, calibration and application can be different.

Please provide the part number and engine information so we can verify the application.

Do your injectors come with calibration information?

For applications that require injector-specific calibration or compensation data, we will confirm the applicable procedure according to the injector and engine configuration.

Not every QSK injector uses the same coding method.

Do you supply new and remanufactured injectors?

Yes.

We supply both new and professionally remanufactured options, depending on the part number and current availability.

Are the injectors tested before shipment?

Yes.

Our applicable bench-testing process evaluates relevant fuel-delivery and injector-performance parameters before shipment.

How long is the warranty?

Our standard warranty is 12 months, subject to the agreed warranty terms.

Can I order different injector part numbers together?

Yes.

We support mixed part-number orders for professional customers, subject to available stock and MOQ requirements.

Can you supply complete QSK injector sets?

Yes.

For customers overhauling an entire engine, we can discuss complete-set requirements according to the engine model and injector part number.

Can you help identify an injector from a photo?

Yes.

Send us a clear photo showing the injector label, part number and connector/body details. We can use the information to assist with preliminary identification.

Get a Quote for Your QSK Fuel Injector

If you are a diesel repair workshop, mining maintenance company, marine service yard, generator repair company or heavy-equipment parts distributor, send us your injector requirements.

Please provide:

Injector Part Number + Engine Model + ESN + Application + Quantity

We will check the available product, quality option, compatibility information, testing status, warranty, packaging and shipping solution.

Contact our technical sales team today for QSK-series fuel injectors and professional diesel fuel-system support.