Cummins ISC Injectors & Fuel System Components

The Cummins ISC engine relies on a high-performance fuel system that ensures clean combustion, efficient power delivery, and long engine life. One of the most critical elements of this system is the injector assembly, supported by seals, O-rings, tubes, and related components that keep fuel pressurized and delivered precisely where it’s needed. At Diesel Pro Power, we supply a complete range of injector parts for the Cummins ISC—trusted by more than 40,000 satisfied customers worldwide.

Cummins ISC Injector Assemblies

The fuel injector is at the core of the ISC’s combustion process. It atomizes diesel fuel into a fine mist, ensuring efficient combustion and maximum power output. Over time, injectors may wear down due to heat, pressure, and fuel impurities. Replacing worn injectors with quality replacements ensures proper engine performance, smoother idle, and lower emissions.

• Precision fuel delivery – Ensures each cylinder receives the correct amount of fuel at the right pressure.

• Restores lost power – Worn injectors can cause rough running, misfires, or low horsepower.

• Reduces fuel consumption – New injectors improve atomization and efficiency.

Cummins ISC Injector Seals

Every injector in the ISC engine uses multiple seals to prevent fuel leaks and maintain compression. A typical configuration requires one injector seal per injector, making them an essential replacement item whenever injectors are serviced or replaced.

• Seals prevent combustion gases from escaping into the fuel system.

• Fuel-tight design keeps diesel under the correct pressure.

• Durable construction resists high heat and chemical breakdown.

Keeping spare injector seals on hand is recommended for service intervals or emergency repairs.

Cummins ISC Injector O-Rings

The injector O-rings provide another layer of sealing protection between the injector body and the cylinder head. Over time, these O-rings can harden or crack due to exposure to diesel fuel, heat, and engine vibration.

• Critical for preventing leaks that can reduce fuel economy and engine efficiency.

• Protect against air intrusion into the combustion chamber.

• Easy replacement item during routine injector maintenance.

Cummins ISC Injector Tubes

Also known as fuel connector tubes, these components deliver high-pressure fuel from the injection pump to each individual injector. A secure, leak-free connection is essential for maintaining the pressures needed for efficient combustion in the ISC engine.

• Hardened steel construction for durability under extreme pressure.

• Precision-machined ends ensure a perfect fit with injectors.

• Replace whenever injectors are removed to prevent leaks and premature wear.

Cummins ISC Fuel Crossover Lines

The crossover lines connect injectors and distribute fuel evenly across the engine. If these lines become clogged, cracked, or corroded, performance issues such as misfiring or uneven cylinder fueling can occur. Replacing lines at the same time as injectors is often recommended.

Signs of Injector Problems in a Cummins ISC

Knowing when to replace injectors and their supporting components can prevent costly repairs:

• Hard starting or extended cranking

• Rough idle or engine misfire

• Excessive black smoke from the exhaust

• Noticeable drop in power or fuel economy

• Strong fuel smell or visible leaks around injectors

If any of these symptoms occur, a full inspection of the injectors, seals, and lines is advised.

Maintaining the ISC Fuel Injection System

Preventive maintenance is key to long-lasting injector performance:

• Use clean, high-quality diesel fuel to reduce contamination.

• Replace fuel filters on schedule to prevent debris from reaching injectors.

• Inspect injectors during overhaul intervals for wear, carbon buildup, or leakage.

• Replace seals and O-rings whenever injectors are serviced to avoid future downtime.

Why Choose Diesel Pro Power for Cummins ISC Injectors

• Largest online selection of Cummins ISC parts with injector components ready to ship.

• Trusted by 40,000+ satisfied customers across marine, industrial, and power generation industries.

• Fast worldwide shipping ensures you get parts when you need them.

• Customer support you can count on for technical questions and part identification.