3999756
Fill Connection
Cummins®

The Cummins 3999756 Fill Connection Fitting is a component designed for use in commercial truck fuel systems. Its role is to facilitate the connection between the fuel tank and the fuel lines, ensuring a secure and efficient transfer of fuel. This fitting is significant in the context of commercial truck operations as it contributes to the overall reliability and performance of the vehicle’s fuel system.

Purpose and Function

The 3999756 Fill Connection Fitting serves a vital role in the operation of a truck by providing a secure interface for the fuel system. It allows for the transfer of fuel from the tank to the engine, ensuring that the vehicle has a consistent and reliable fuel supply. Within the fuel system, this fitting helps maintain the integrity of the fuel line connections, preventing leaks and ensuring that fuel is delivered efficiently to the engine ¹.

Key Features

The Cummins 3999756 Fill Connection Fitting is constructed from durable materials that are resistant to corrosion and wear, ensuring longevity and reliability. Its design includes precision-machined components that ensure a tight and secure fit, minimizing the risk of fuel leaks. Additionally, the fitting features easy-to-use connections that simplify the installation and maintenance processes ².

Benefits

The advantages provided by the 3999756 Fill Connection Fitting include enhanced fuel system efficiency, increased durability, and ease of use. The secure connection it provides helps maintain the integrity of the fuel system, reducing the likelihood of fuel leaks and ensuring a consistent fuel supply to the engine. Its durable construction and easy-to-use design make it a reliable and convenient component for commercial truck operations ³.

Installation Process

To install the 3999756 Fill Connection Fitting, begin by ensuring that the fuel system is depressurized and that all necessary tools and components are on hand. Next, carefully remove the old fitting, taking care not to damage the surrounding components. Clean the fuel tank and fuel line connections to ensure a secure fit. Then, install the new fitting, ensuring that all connections are tight and secure. Finally, test the system for leaks and proper operation before returning the vehicle to service.

Maintenance and Troubleshooting

Regular maintenance of the 3999756 Fill Connection Fitting includes inspecting the fitting and connections for signs of wear, corrosion, or damage. Common issues to watch for include fuel leaks, loose connections, and corrosion. If any issues are detected, they should be addressed promptly to prevent further damage to the fuel system. Troubleshooting steps may include tightening connections, replacing worn or damaged components, and cleaning the fitting and connections to ensure optimal performance.

Safety Considerations

When working with the 3999756 Fill Connection Fitting, it is important to follow safety precautions and guidelines to ensure safe and effective use. This includes wearing appropriate personal protective equipment, working in a well-ventilated area, and following all manufacturer recommendations for installation, maintenance, and troubleshooting. Additionally, it is important to ensure that the fuel system is depressurized before beginning any work to prevent the risk of fuel spills or accidents.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history dating back to 1919, Cummins has established a reputation for quality, reliability, and innovation in the commercial truck industry. The company offers a wide range of products and services designed to meet the needs of commercial truck operators, including engines, transmissions, aftermarket parts, and service solutions.

Cummins Fill Connection Fitting 3999756 Compatibility

The Cummins Fill Connection Fitting part number 3999756 is designed to fit seamlessly with a variety of Cummins engines, ensuring a secure and reliable connection for fuel or fluid transfer. This fitting is engineered to meet the stringent standards required for high-performance engines, providing durability and ease of installation.

K38 and K50 Engines

The Fill Connection Fitting 3999756 is compatible with the K38 and K50 engines. These engines are known for their robust construction and efficiency, making them suitable for a range of applications. The fitting ensures that the connection between the fuel or fluid source and the engine is both secure and leak-proof, which is crucial for maintaining engine performance and longevity.

QSK50 CM2150 and QSK50 CM2150 MCRS Engines

For the QSK50 CM2150 and QSK50 CM2150 MCRS engines, the Fill Connection Fitting 3999756 is an ideal choice. These engines are part of Cummins’ QSK series, which is renowned for its power and reliability. The fitting’s design allows for easy integration into the engine’s fuel system, ensuring that the connection is both tight and durable. This is particularly important for the MCRS variant, which may have additional requirements for fluid management.

QSK60 CM850 MCRS Engine

The QSK60 CM850 MCRS engine also benefits from the Fill Connection Fitting 3999756. This engine is part of the QSK60 series, which is designed for heavy-duty applications. The fitting’s compatibility with this engine ensures that the connection is robust and capable of handling the demands of high-performance operations. The MCRS designation indicates that the engine is equipped with advanced management systems, and the fitting supports these systems by providing a reliable connection.

Role of Part 3999756 Fill Connection Fitting in Engine Systems

The Part 3999756 Fill Connection Fitting is an essential component in the integration and operation of various engine systems, particularly within the engine cooling system. Its primary function is to facilitate the secure and efficient connection between the coolant reservoir and the engine’s cooling system. This fitting ensures that coolant can be added to or removed from the system as needed, maintaining optimal coolant levels for effective heat management.

In the context of the heat exchanger, the Fill Connection Fitting plays a supportive role by ensuring that the coolant system remains pressurized and sealed. This is vital for the heat exchanger to function correctly, as it relies on a consistent flow of coolant to transfer heat away from the engine and into the surrounding air. The fitting’s design allows for the easy addition of coolant, which is necessary when the system is bled of air or when coolant is lost due to leaks or maintenance procedures.

Within the overall engine cooling system, the Fill Connection Fitting is a key point of interaction for maintenance and repair. It allows mechanics to top off the coolant levels, perform pressure tests, and ensure that the system is free of air pockets that can impede cooling efficiency. The fitting’s location and design are tailored to the specific requirements of the engine it serves, ensuring a snug fit and reliable seal.

Conclusion

In summary, the Cummins 3999756 Fill Connection Fitting is a versatile and essential component for both fuel and coolant systems in commercial trucks. Its durable construction, ease of installation, and compatibility with various Cummins engines make it a valuable part for maintaining engine performance and reliability. Regular maintenance and adherence to safety guidelines are crucial for ensuring the longevity and efficiency of this fitting.