3936668
Fan Pilot Spacer
Cummins®

Introduction

The Fuel Injector Supply Tube 3936668 is a component designed by Cummins for use in heavy-duty trucks. This part is integral to the fuel delivery system, ensuring that fuel is efficiently transferred from the fuel tank to the fuel injectors. Its role is vital in maintaining the overall performance and efficiency of the engine ¹.

Purpose and Function

The Fuel Injector Supply Tube plays a significant role in the fuel delivery system by facilitating the transfer of fuel from the fuel tank to the fuel injectors. This tube ensures a consistent and reliable supply of fuel, which is essential for the proper operation of the engine. It helps maintain the necessary fuel pressure and flow rate required for optimal engine performance ².

Key Features

The design and construction of the Fuel Injector Supply Tube 3936668 are tailored for durability and efficiency. It is made from high-quality materials that can withstand the harsh conditions typically encountered in heavy-duty truck applications. The tube is engineered to be resistant to corrosion and wear, ensuring long-lasting performance. Additionally, its design includes features that enhance fuel flow and reduce the risk of leaks, contributing to overall system reliability ³.

Benefits

Using the Fuel Injector Supply Tube 3936668 offers several advantages. It contributes to improved fuel efficiency by ensuring a consistent and reliable fuel supply to the injectors. This consistent fuel delivery enhances engine performance, allowing for smoother operation and better power output. The tube’s robust construction and design also provide reliability across various operating conditions, making it a valuable component for heavy-duty applications.

Installation and Compatibility

Proper installation of the Fuel Injector Supply Tube is important for ensuring its effective performance. Installation procedures should follow manufacturer guidelines to avoid common pitfalls. Necessary tools and precautions should be observed to ensure a secure and leak-free connection. Compatibility with specific engine models and systems should be verified to ensure optimal performance and integration within the fuel delivery system.

Maintenance and Troubleshooting

Routine maintenance practices are recommended to ensure the longevity and efficiency of the Fuel Injector Supply Tube. Regular inspections for signs of wear, corrosion, or leaks can help identify potential issues before they become critical. Common issues may include fuel leaks or reduced fuel flow, which can often be addressed through proper maintenance and timely replacements of worn components.

Safety Considerations

When working with the Fuel Injector Supply Tube, it is important to observe safety guidelines and precautions. Handling fuel requires careful attention to avoid spills and ensure proper ventilation. Additionally, performing maintenance tasks should be done with the engine off and the fuel system depressurized to prevent accidents. Following these safety practices helps maintain a safe working environment.

Cummins Overview

Cummins Inc. is a well-established company with a strong reputation in the automotive and heavy-duty truck industry. Founded in 1919, Cummins has a long history of innovation and quality in engine design and manufacturing. The company offers a wide range of products, including engines, filtration systems, and aftermarket parts, all designed to meet the demanding needs of various industries. Cummins is known for its commitment to quality, reliability, and customer satisfaction.

Cummins Fuel Injector Supply Tube (Part 3936668) Compatibility

The Cummins Fuel Injector Supply Tube, part number 3936668, is a critical component in the fuel delivery system of various Cummins engines. This part is designed to ensure a reliable and efficient fuel supply to the injectors, which is essential for maintaining optimal engine performance. Here is a detailed overview of the engines with which this part is compatible:

6B5.9 Series

• 6B5.9 CM2670 B152B
• 6B5.9 CM2670 B152B

ISB/ISD Series

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB5.9G CM2180

ISBE Series

• ISBE CM2150
• ISBE4 CM850

QSB Series

• QSB5.9 CM2880 B115
• QSB5.9G
• QSB7 CM2880 B117

The Cummins Fuel Injector Supply Tube (part 3936668) is engineered to fit seamlessly within the fuel systems of these engines, ensuring that the fuel injectors receive the correct amount of fuel at the right pressure. This compatibility is crucial for maintaining the engine’s efficiency and longevity. The part’s design allows for easy installation and replacement, making it a reliable choice for maintenance and repair purposes.

Role of Part 3936668 Fuel Injector Supply Tube in Engine Systems

The Fuel Injector Supply Tube (part number 3936668) is an essential component in the fuel delivery system of an engine. It is responsible for transporting fuel from the fuel rail to the individual fuel injectors. This ensures that each injector receives a consistent and precise amount of fuel, which is vital for the engine’s performance and efficiency.

Interaction with Other Components

1. Fuel Rail: The supply tube is directly connected to the fuel rail, which distributes fuel to all injectors. The tube’s role is to provide a secure and leak-free passage for fuel from the rail to the injectors.

2. Fuel Injectors: Each fuel injector is supplied with fuel through the supply tube. The tube’s design ensures that fuel is delivered under the correct pressure and at the right temperature, allowing the injectors to atomize the fuel effectively for combustion.

3. Spacer: In some engine designs, a spacer may be used between the fuel rail and the cylinder head to ensure proper alignment and spacing. The supply tube must fit precisely within this spacer to maintain the integrity of the fuel delivery system.

4. Fan Pilot: Although the fan pilot is primarily associated with the engine’s cooling system, its operation can influence the temperature of the fuel. The supply tube must be designed to withstand any temperature variations caused by the proximity to the fan pilot, ensuring that fuel viscosity remains within optimal ranges for injection.

Functional Significance

The Fuel Injector Supply Tube plays a significant role in maintaining the engine’s fuel delivery system’s reliability and performance. By ensuring a consistent fuel supply to each injector, it contributes to the engine’s overall efficiency, power output, and emissions control. The tube’s integration with other components like the fuel rail, spacer, and consideration of the fan pilot’s influence underscores its importance in the complex interplay of engine systems.

Conclusion

The Fuel Injector Supply Tube 3936668 by Cummins is a critical component in the fuel delivery system of heavy-duty trucks. Its design and construction ensure durability, efficiency, and reliability, contributing to improved engine performance and fuel efficiency. Proper installation, maintenance, and adherence to safety guidelines are essential for maximizing the benefits of this Cummins part.