The barrel and plunger fuel injection system represents a foundational technology in diesel engine design. Cummins incorporated this system into several of its most durable engine platforms.

How the System Works

Fuel is drawn into the barrel, where the plunger compresses it to high pressure before injection. Mechanical timing and metering ensure stable engine operation without electronic assistance.

This design is particularly resistant to electrical failures and harsh operating conditions.

Cummins Engine Platforms That Use It

• N855 / NT855 Engines – Popular in trucking, marine, and power generation

• KTA Series Engines – Used in mining, construction, and large generators

• Mechanical Industrial Engines – Built before the widespread adoption of electronic fuel systems

These engines are known for their rugged construction and long service intervals.

Why Cummins Chose Mechanical Injection

Cummins engineers selected barrel and plunger systems for their:

• Mechanical precision

• Proven reliability

• Ease of calibration

• Adaptability across different applications

These features helped establish Cummins as a trusted engine manufacturer worldwide.

Summary

While modern technology has changed diesel fuel systems significantly, barrel and plunger injection remains a key part of Cummins’ engineering legacy. Many of these engines continue to operate efficiently with proper care.