4009781
Fuel Supply Tube
Cummins®

The Cummins 4009781 Fuel Supply Tube is a critical component in the fuel systems of commercial trucks, designed to deliver fuel from the tank to the engine efficiently. This part ensures a consistent and reliable fuel supply, which is essential for maintaining engine performance and efficiency ¹.

Basic Concepts of Fuel Supply Tubes

A fuel supply tube serves as a conduit for transporting fuel from the storage tank to the engine. It is a vital component in the fuel system, ensuring the precise delivery of fuel required for combustion. The tube maintains fuel pressure and flow, which are crucial for the engine’s operation. Without a properly functioning fuel supply tube, the engine may face issues such as reduced power, inefficient combustion, or failure to start ².

Role of the Cummins 4009781 Fuel Supply Tube in Truck Operation

This Cummins part contributes to truck operation by providing a dedicated pathway for fuel to travel from the tank to the engine. It ensures that the engine receives the necessary fuel at the correct pressure and flow rate, which is vital for optimal performance and efficiency. The tube’s design and materials are chosen to withstand the pressures and temperatures encountered in the fuel system, ensuring reliable operation under various driving conditions ³.

Key Features

The Cummins 4009781 Fuel Supply Tube is characterized by its robust design and the use of high-quality materials. These features are intended to enhance its performance and durability. The tube is engineered to resist corrosion and wear, which can be caused by the fuel it carries. Its construction is also designed to accommodate the dynamic conditions within the fuel system, such as changes in pressure and temperature ⁴.

Benefits

This part offers several benefits. It contributes to improved fuel delivery by providing a reliable conduit for fuel to reach the engine. This can lead to enhanced engine performance, as the engine receives a consistent supply of fuel. Additionally, the tube’s durable construction and resistance to wear and corrosion increase the reliability of the fuel system, potentially reducing the need for frequent maintenance or replacement ⁵.

Troubleshooting and Maintenance

Common issues with fuel supply tubes may include leaks, blockages, or damage due to wear and corrosion. To address these issues, it is important to perform regular inspections of the tube and the fuel system as a whole. Maintenance practices may include checking for signs of wear or corrosion, ensuring connections are secure, and replacing the tube if it shows signs of damage or failure. Proper maintenance can help ensure the optimal performance and longevity of the fuel supply tube ⁶.

Compatibility of Cummins Fuel Supply Tube 4009781

The Cummins Fuel Supply Tube part number 4009781 is designed to fit seamlessly with several of Cummins’ engine models. This part is integral to the fuel delivery system, ensuring that fuel is efficiently and accurately supplied to the engine components. Below is a detailed look at the compatibility of this part with specific engine models.

Compatible Engine Models

• ISC CM554
• ISL CM554
• QSC8.3 CM554
• QSL9 CM554

Each of these engines benefits from the precise engineering of the Cummins Fuel Supply Tube 4009781, ensuring that the fuel delivery system operates at peak efficiency. This compatibility is crucial for maintaining the integrity and performance of these engines, making the part an essential component for their operation ⁷.

Integration with Key Components

1. Fuel Pump and Fuel Pump Kit: The Fuel Supply Tube connects directly to the fuel pump, which is responsible for drawing fuel from the tank and pressurizing it. In systems where a fuel pump kit is used, this tube ensures that the pressurized fuel is efficiently transferred to the next stage of the fuel system.

2. Fuel Injection Pump: This tube plays a significant role in delivering fuel to the fuel injection pump. The injection pump relies on a steady fuel supply to meter and inject fuel into the combustion chambers at the precise moment and in the correct quantity.

3. Cam Housing Module: In engines where the cam housing module is part of the fuel system, the Fuel Supply Tube interfaces with this module to facilitate the flow of fuel to the injection pump. The cam housing often houses the injection pump, making the tube’s role vital in maintaining the integrity of the fuel supply line.

4. Male Union Kit: The Fuel Supply Tube often connects to a male union kit, which serves as a junction point in the fuel system. This connection allows for easy maintenance and replacement of the tube without disrupting the entire fuel system.

5. Campaign Kit: In scenarios where a campaign kit is utilized, which may include various fuel system components for upgrades or repairs, the Fuel Supply Tube is a key element. It ensures that the upgraded or repaired system maintains a reliable fuel supply.

Conclusion

The Cummins 4009781 Fuel Supply Tube is an essential component in the fuel delivery system of various engine setups. Its primary function is to transport fuel from the fuel pump to the fuel injection pump, ensuring a consistent and reliable fuel supply to the engine. The tube’s integration with key components such as the fuel pump, fuel injection pump, cam housing module, male union kit, and campaign kit underscores its importance in maintaining the efficiency and performance of the engine. Regular maintenance and proper troubleshooting are crucial to ensure the longevity and optimal performance of this part.