Injectors For Cummins Marine & Industrial Diesel Engines

High-Performance Fuel Injectors for Cummins Engines

Cummins has earned its place as a global leader in diesel engine design over the past century — and at Diesel Pro Power, we continue that legacy with premium aftermarket injectors and components tailored for Cummins marine and industrial engines.

From 4-cylinder B Series to high-displacement KTA models, our injectors and fuel delivery parts are in stock and ready to ship within 24 hours. Whether you're performing maintenance, replacing damaged components, or doing a full injector service, Diesel Pro Power has the complete solution.

Our Injector Product Range

Individual Cummins Injectors

We offer exact-fit, brand-new injectors engineered to deliver clean, efficient combustion. Each injector meets or exceeds OEM flow, pressure, and durability standards — designed for continuous use in commercial marine, generator, or industrial applications.

Injector Kits

Each injector kit typically includes:

• One fuel injector

• Required sealing washers

• Hold-down bolts or nuts (when applicable)

• Injector o-rings or copper seals

These kits are ideal when replacing injectors individually, offering convenience without having to source multiple small components separately.

Injector Installation Kits

For some Cummins engine series, we offer complete injector installation kits that include:

• Injector seals (copper, o-ring, or bonded)

• Tube or nozzle seals

• Retainer bolts or clamps

• Thread sealant or gasket compound (optional)

These kits are crucial to ensuring a leak-free, pressure-tight installation. Using old seals or incorrect torque during reinstallation can result in fuel leaks, compression loss, and premature injector failure.

Injector Seals

Injector seals are small but critical components that sit between the injector and cylinder head or fuel rail. Replacing them is mandatory any time an injector is removed.

We offer:

• O-ring style seals for electronic injectors

• Copper crush washers for mechanical injectors

• Nozzle tip gaskets for fuel tube sealing

• Back-up washers and spacers where needed

Why replace injector seals?

• Prevents combustion gas from escaping around the injector

• Maintains injection pressure inside the cylinder

• Reduces heat transfer to the injector body

• Avoids contamination from fuel leaks

Each seal is engineered to match the injector bore geometry of your specific Cummins model.

Tappet Assemblies (Cam Followers)

Tappets, also known as cam followers or lifters, control injector and valve actuation in mechanical Cummins engines. These components ride directly on the camshaft and transfer motion to the injector rocker arms or push rods.

Tappet assemblies we offer include:

• Precision-ground tappet bodies

• Roller or flat tappet heads

• Oil ports for lubrication

• Tappet guides or sleeves (where applicable)

Symptoms of worn tappets:

• Uneven injector fuel delivery

• Misfires or rough idle

• Excessive valve lash

• Noisy top-end operation

Tappet failure can damage the camshaft and create irregular wear across injectors. If you're replacing injectors in a high-hour engine, inspect tappets for scoring, spalling, or flat spots and replace as needed.

Fuel Manifolds

Fuel manifolds distribute pressurized diesel evenly across all injectors in many Cummins engines, especially the B, 855, and KTA series. A damaged or internally restricted manifold can cause uneven injector timing or rail pressure issues.

Fuel manifold failures can lead to:

• Cylinder imbalance

• Excessive smoke

• Injector knock

• Poor fuel economy

Our replacement manifolds restore proper injector flow and simplify high-pressure fuel system troubleshooting.

Cummins Injector Catalog by Engine Series

Explore compatible injectors, seals, kits, and manifolds by choosing your engine family below:

Cummins B Series

The Cummins B Series — including the 4B, 6B, ISB, and QSB engines — powers thousands of workboats, gensets, and construction machines globally. We stock mechanical and electronic injectors for all variations, including QSB models with common rail systems. Installation kits and seals are available for every injector listed.

• Injector Catalog for Cummins 4B Engines

• Injector Catalog for Cummins 4BT Engines

• Injector Catalog for Cummins 4BTA Engines

• Injector Catalog for Cummins 6B Engines

• Injector Catalog for Cummins 6BT Engines

• Injector Catalog for Cummins 6BTA Engines

• Injector Catalog for Cummins ISB 4.5 Engines
• Injector Catalog for Cummins ISB 5.9 Engines
• Injector Catalog for Cummins ISB 6.7 Engines

• Injector Catalog for Cummins QSB 4.5 Engines

• Injector Kit for Cummins 4B, 4BT, 4BTA, 6B, 6BT, 6BTA, ISB, and QSB 4.5 engines
  
  
• Fuel Manifold for Cummins 4B, 4BT, 4BTA, 6B, 6BT, 6BTA, ISB, and QSB 4.5 engines
  
  
• Banjo Connector Seal for Cummins 4B, 4BT, 4BTA, 6B, 6BT, 6BTA, ISB, and QSB 4.5 engines

• Injector Catalog for Cummins QSB 5.9 Engines

• Injector Catalog for Cummins QSB 6.7 Engines
  
  
• Injectors Catalog for Cummins QSB 7.0 Engines

Cummins C Series

The 6C and 6CTA engines are popular in commercial marine vessels and stationary industrial equipment. Diesel Pro Power carries injectors for both mechanical and electronic versions of these engines, including the ISC and QSC platforms. We offer direct-replacement injectors along with sealing washers and injector hardware kits.

• Injector Catalog for Cummins 6C Engines

• Injector Catalog for Cummins 6CT Engines

• Injector Catalog for Cummins 6CTA Engines

• Injector Catalog for Cummins ISC Engines

• Injector Catalog for Cummins QSC Engines

• Injector Seal for C Series engines
  
  
• Injector kit for 6C, 6CT, and 6CTA Series engines
  
  
• Injector kit for 6C, 6CT and 6CTA engines
  
  
• New Injector kit, for cummins 6C, 6CT and 6CTA engines

Cummins L Series

The Cummins L10, ISL, and QSL engines are widely used in large industrial applications and marine auxiliary power units. Our injectors are designed to meet high duty-cycle demands and are stocked with optional kits for faster installation and field service.

Injector Catalog for Cummins L10 Engines

• New tappet assembly for Cummins L10 engine 
  
  
  
• Injector Catalog for Cummins ISL Engines

• Injector Catalog for Cummins QSL Engines

Cummins M Series

For M11, ISM, and QSM11 engines, we offer fuel injectors that support high-horsepower propulsion, power generation, and continuous-load operations. These injectors are designed for reliability in demanding marine conditions and heavy-duty industrial applications.

• Injector Catalog for Cummins M11 Engines

• Injector Catalog for Cummins ISM Engines

• Injector Catalog for Cummins QSM11 Engines

• New tappet assembly for Cummins M series engines
  

Cummins 855 Series

Built for raw torque and long-haul marine reliability, the NT855 and NH855 models remain in use across commercial vessels and standby generator fleets. Diesel Pro Power stocks direct-fit injectors for these mechanical fuel systems with the correct compression seals.

• Injector Catalog for Cummins NH855 Engines

• Injector Catalog for Cummins NT855 Engines

• Injector Catalog for Cummins N14 Engines

• Injectors for N14 Engines - Rebuilt for the Cummins N14 engine
  
  

• Injector Repair Kit for Cummins N14 engine
  
  
• New tappet assembly, for Cummins N14 engines

Cummins K Series

From the legendary KTA19 to the QSK19, these engines serve in ferries, dredges, and industrial platforms. We carry Cummins injectors designed to match each fuel system generation — from mechanical pump-fed setups to more modern electronically controlled fuel rails.

• Injector Catalog for Cummins KTA19 Engines

• Injector Catalog for Cummins KTA38 Engines

• Injector Catalog for Cummins KTA50 Engines

• Injector Catalog for Cummins QSK19 Engines

• Injector kit for Cummins K series engines
  
  
• Injector Installation Kit for Cummins K series engines
  
  
• Injector Mounting seal for Cummins K engines
  
  
• New tappet assembly, for Cummins QSK19 engine

Cummins X Series (Industrial Only)

Used in oil and gas, mining, and power generation, the ISX and QSX are high-output engines that rely on precision fuel delivery. We stock electronic injectors for these models, with compatible seals and fast worldwide shipping for urgent replacements.

• Injector Catalog for Cummins  ISX Single Cam Engines
• Injector Catalog for Cummins ISX Dual Cam Engines
• Injector Catalog for Cummins QSX Engines
  
  

• Injector for Cummins ISX and QSX engines - Rebuilt
  
  

• Injector Repair Kit for ISX and QSX engines

Why Choose Diesel Pro Power for Cummins Injectors?

✅ In Stock and Ready to Ship

Injectors, kits, seals, and fuel manifolds are ready to go — and most orders ship in under 24 hours.

✅ Expert Assistance

From installation torque to identifying worn tappets, we offer one-on-one support. Whether it’s your first injector job or your hundredth, we’ve got your back.

✅ Fast Global Shipping

With global service and expedited options, we’re trusted by commercial fleets, marine engineers, independent mechanics, and OEMs in over 100 countries.

✅ One-Year Warranty

Every brand-new injector and accessory includes our 12-month warranty for peace of mind — even on international orders.

Get the Right Cummins Diesel Injector Today

Need help selecting injectors, seals, or tappets? Call us:

• U.S. & Canada: 888-433-4735

• International: 305-545-5588

You can also use our after-hours contact form and we’ll respond quickly.