3935979
Fuel Injection Pump
Cummins®

Introduction

The Cummins 3935979 Fuel Injection Pump is a component designed for use in commercial trucks. It plays a significant role in the operation of these vehicles by ensuring the precise delivery of fuel to the engine. This pump is integral to maintaining the performance and efficiency of diesel engines in heavy-duty applications.

Basic Concepts of Fuel Injection Pumps

A fuel injection pump is a device that pressurizes and delivers fuel to the engine’s combustion chambers. It operates by using mechanical or electronic controls to regulate the amount and timing of fuel injection. In diesel engines, the fuel injection pump is responsible for atomizing fuel into a fine mist, which is then injected into the combustion chamber under high pressure. This process ensures efficient fuel combustion and optimal engine performance ¹.

Operation of the Cummins 3935979 Fuel Injection Pump

The Cummins 3935979 Fuel Injection Pump functions by utilizing engine-driven mechanical components to pressurize and deliver fuel. It consists of several key components, including the pump body, plungers, and control mechanisms. As the engine operates, the pump plungers move within their respective barrels, creating pressure that forces fuel through the injectors into the engine cylinders. The timing and quantity of fuel delivery are controlled by the pump’s internal mechanisms, ensuring precise fuel injection for efficient combustion ².

Purpose of the Cummins 3935979 Fuel Injection Pump

The Cummins 3935979 Fuel Injection Pump serves to ensure efficient fuel delivery within the engine. By precisely controlling the amount and timing of fuel injection, it enhances engine performance and contributes to the overall operation of the truck. This pump is designed to meet the demanding requirements of commercial truck engines, providing reliable fuel delivery under various operating conditions.

Key Features

The Cummins 3935979 Fuel Injection Pump is characterized by several key features. These include precision engineering, which ensures accurate fuel delivery, and durability, allowing it to withstand the rigors of heavy-duty use. Additionally, this pump is designed for compatibility with specific Cummins engine models, ensuring optimal performance and efficiency.

Benefits of Using the Cummins 3935979 Fuel Injection Pump

Utilizing the Cummins 3935979 Fuel Injection Pump offers several advantages. It contributes to improved fuel efficiency by ensuring precise fuel delivery, which reduces waste and enhances engine performance. Additionally, this pump supports enhanced power output, allowing the engine to operate at its full potential. Its reliable performance under various operating conditions makes it a valuable component for commercial truck applications ³.

Troubleshooting Common Issues

Common issues associated with the Cummins 3935979 Fuel Injection Pump may include leaks, misfires, and irregular fuel delivery. Identifying these problems often involves inspecting the pump and its components for signs of wear, damage, or malfunction. Addressing these issues may require cleaning, adjustment, or replacement of affected parts to restore proper pump operation.

Maintenance Tips

To ensure the longevity and optimal performance of the Cummins 3935979 Fuel Injection Pump, routine maintenance practices are recommended. These include regular inspections to check for leaks, wear, or damage, cleaning the pump and its components to remove contaminants, and ensuring proper lubrication of moving parts. Adhering to these maintenance tips can help prevent issues and extend the service life of the pump.

Cummins Corporation

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality and innovation in the automotive and commercial vehicle industry. The company offers a wide range of products and services designed to meet the needs of customers worldwide, including engines, powertrains, and aftermarket parts.

Cummins Fuel Injection Pump 3935979 Compatibility

The Cummins Fuel Injection Pump 3935979 is a critical component designed to ensure efficient fuel delivery in various engine configurations. This part is engineered to fit seamlessly with specific engine models, enhancing performance and reliability.

Engine Compatibility

• 6B5.9 Engines: The 3935979 fuel injection pump is specifically designed to integrate with the 6B5.9 engine series. This compatibility ensures that the pump meets the unique demands of the 6B5.9 engine, providing precise fuel metering and optimal combustion efficiency.

• Grouped Engine Models: The 3935979 fuel injection pump is also compatible with other engine models within the same family. This grouping ensures that the pump’s design and functionality align with the broader engine specifications, facilitating easy installation and consistent performance across different engine variants.

Installation and Performance

When installed in the 6B5.9 engines, the 3935979 fuel injection pump delivers several key benefits:

• Enhanced Fuel Efficiency: The pump ensures that the engine receives the correct amount of fuel at the right time, improving overall fuel efficiency.
• Consistent Power Output: By providing a steady and precise fuel supply, the pump helps maintain consistent power output, which is crucial for engine performance.
• Reduced Emissions: Proper fuel metering contributes to lower emissions, making the engine more environmentally friendly.
• Longevity and Reliability: The design of the 3935979 pump is built to withstand the rigors of continuous operation, ensuring longevity and reliability in demanding conditions.

Technical Specifications

While the specific technical specifications of the 3935979 fuel injection pump are not detailed here, it is important to note that this part is engineered to meet the stringent requirements of Cummins engines. The pump’s design incorporates advanced features such as:

• High-Pressure Fuel Delivery: Capable of delivering fuel at high pressures, ensuring efficient combustion.
• Precision Timing: Accurate timing mechanisms to synchronize fuel delivery with engine cycles.
• Durable Construction: Built with high-quality materials to withstand the demands of heavy-duty applications.

By ensuring compatibility with the 6B5.9 engines and other grouped models, the Cummins 3935979 fuel injection pump plays a vital role in maintaining engine performance and efficiency.

Synergy with Base Fuel Pump

The Cummins 3935979 Fuel Injection Pump works in tandem with the Base Fuel Pump to ensure optimal performance of the engine system. The Base Fuel Pump is responsible for drawing fuel from the tank and delivering it to the Fuel Injection Pump under pressure. This pressurized fuel is then metered precisely by the 3935979 pump and delivered to the injectors at the exact moment required for combustion. The synergy between these components is fundamental to the engine’s fuel system, ensuring efficient burning and power generation.

Conclusion

The Cummins 3935979 Fuel Injection Pump is a critical component in the efficient operation of commercial truck engines. Its precise fuel delivery, compatibility with specific engine models, and robust design contribute to enhanced engine performance, fuel efficiency, and reliability. Regular maintenance and proper installation are essential to maximize the benefits of this part.