4939679
Fuel Drain Tube
Cummins®

The Cummins 4939679 Fuel Drain Tube is a critical component in the fuel systems of heavy-duty trucks. It is designed to facilitate the drainage of excess fuel and maintain system pressure, ensuring efficient fuel delivery and overall system integrity.

Basic Concepts of Fuel Drain Tubes

A Fuel Drain Tube is a vital component within the fuel system that allows for the removal of excess fuel. It provides a pathway for fuel to exit the system when necessary, which helps in maintaining the desired pressure levels within the fuel system and ensures that the fuel delivery remains efficient and consistent. This component is integral to the proper functioning of the fuel system, as it helps prevent issues such as fuel overflow and pressure imbalances ¹.

Purpose of the Cummins 4939679 Fuel Drain Tube

The Cummins 4939679 Fuel Drain Tube plays a specific role in the operation of a truck’s fuel system. It is designed to drain excess fuel, which can accumulate due to various factors such as changes in temperature or fuel expansion. By providing a means for this excess fuel to be expelled, the tube helps maintain the optimal pressure within the fuel system. This, in turn, contributes to the efficient operation of the fuel injection system and ensures that the engine receives a consistent supply of fuel ².

Key Features

This Cummins part is constructed from materials that offer durability and resistance to the corrosive effects of fuel. Its design includes features that enhance its efficiency and reliability, such as precise engineering to ensure a secure fit within the fuel system. Additionally, the tube may incorporate unique attributes that distinguish it from other fuel drain tubes, such as enhanced sealing mechanisms to prevent leaks and ensure a tight connection.

Benefits of Using the Cummins 4939679 Fuel Drain Tube

Utilizing this part offers several advantages. It contributes to improved fuel system performance by ensuring that excess fuel is efficiently drained, which helps maintain system pressure and prevents potential issues such as fuel overflow. The tube also reduces the risk of fuel contamination by providing a dedicated pathway for excess fuel to exit the system, thereby helping to keep the fuel clean and free from impurities. Furthermore, the use of this tube enhances the overall reliability of the truck’s fuel system, contributing to smoother operation and potentially extending the lifespan of other fuel system components ³.

Installation and Integration

Proper installation of the Cummins 4939679 Fuel Drain Tube is crucial for its effective operation within a truck’s fuel system. The installation process involves several steps, including preparing the fuel system for the new component, ensuring that all connections are secure, and verifying that the tube is correctly positioned to facilitate the drainage of excess fuel. Tools required for installation may include wrenches for tightening connections and possibly a fuel system cleaner to ensure that the system is free from contaminants before installation.

Troubleshooting Common Issues

Common problems associated with fuel drain tubes can include leaks or blockages. Leaks may occur due to improper installation, damaged seals, or corrosion, while blockages can result from debris or fuel contaminants. Troubleshooting these issues involves inspecting the tube and its connections for signs of damage or wear, cleaning the tube and surrounding components to remove any contaminants, and ensuring that all connections are tight and secure. In some cases, replacement of the tube may be necessary to resolve persistent issues.

Maintenance Tips

Regular maintenance of the Cummins 4939679 Fuel Drain Tube is important for ensuring its longevity and optimal performance. This includes periodic inspection of the tube and its connections for signs of wear or damage, cleaning the tube to remove any accumulated debris or contaminants, and checking for proper operation by ensuring that excess fuel is being drained efficiently. Replacement of the tube may be considered if significant wear or damage is detected, or if the tube is no longer functioning as intended.

Cummins: A Brief Overview

Cummins Inc. is a well-established manufacturer in the automotive and heavy-duty truck industry, known for its commitment to quality and innovation in the production of automotive components. With a history spanning several decades, Cummins has built a reputation for delivering reliable and high-performance parts, including fuel system components like the 4939679 Fuel Drain Tube. The company’s product range encompasses a wide array of engine and powertrain solutions, designed to meet the demanding requirements of heavy-duty applications.

Compatibility with Cummins Engines

The Cummins part number 4939679, a Fuel Drain Tube, is designed to fit into several of the company’s engine models. This part is integral to the fuel system, facilitating the removal of water and sediment that can accumulate in the fuel tank.

For the ISB series, the 4939679 Fuel Drain Tube is compatible with the ISB CM2150, ISB6.7 CM2250, and ISB6.7 CM2350 B101 engines. These engines are known for their robust performance and are often used in heavy-duty applications, where the reliability of the fuel system is paramount.

In the QSB series, the same part number is used for the QSB6.7 CM2250 and QSB6.7 M CM2250 engines. These engines are typically found in a variety of applications, from agricultural to industrial, where they provide dependable power and efficiency.

The Fuel Drain Tube’s design ensures that it can be easily integrated into the fuel system of these engines, providing a straightforward maintenance solution that helps to prolong the life of the engine by preventing contamination of the fuel.

Role of Part 4939679 Fuel Drain Tube in Engine Systems

The 4939679 Fuel Drain Tube is a critical component within the fuel system of various engine setups. Its primary function is to facilitate the safe and efficient removal of fuel from the system, ensuring that any excess or contaminated fuel is properly drained away. This process is vital for maintaining the integrity and performance of the engine.

In the context of the fuel system, the Fuel Drain Tube interfaces directly with the fuel tank and the fuel lines. When the system is purged or when maintenance procedures require the draining of fuel, the tube provides a clear pathway for the fuel to exit the system. This is particularly important in scenarios where fuel quality may be compromised, such as when water or debris has entered the fuel tank.

The tube also plays a role in conjunction with the fuel plumbing components. It ensures that the fuel lines remain clear of any obstructions that could impede the flow of fuel to the engine. By allowing for the periodic draining of fuel, it helps prevent the buildup of contaminants that could otherwise lead to engine malfunctions or reduced efficiency.

Furthermore, the Fuel Drain Tube is integral to the overall fuel management system. It works in tandem with fuel filters and sensors to maintain a clean and consistent fuel supply. This is especially important in high-performance engines where fuel quality directly impacts engine output and reliability.

Conclusion

In summary, the Cummins 4939679 Fuel Drain Tube is a key component that enhances the functionality and maintenance of the fuel system. Its role in facilitating the safe drainage of fuel contributes to the overall efficiency and longevity of the engine.