3944458
Fuel Supply Tube
Cummins®

Introduction

The Fuel Supply Tube, specifically the 3944458 model by Cummins, is a critical component in the fuel system of commercial trucks. It ensures a consistent and adequate supply of fuel from the tank to the engine, which is essential for optimal engine operation and performance ².

Basic Concepts of Fuel Supply Tubes

A Fuel Supply Tube serves as a conduit for transporting fuel from the fuel tank to the engine’s fuel injection system. It operates under the pressure generated by the fuel pump, ensuring a reliable pathway for fuel flow. The design and material selection of this part are crucial for maintaining fuel integrity and preventing leaks or blockages ¹.

Role of the 3944458 Fuel Supply Tube in Truck Operation

This Cummins part ensures a steady supply of fuel to the engine, contributing to engine performance and efficiency. Its design and construction are tailored to withstand the pressures and temperatures within the fuel system, ensuring reliable performance in demanding commercial truck applications ².

Key Features

The 3944458 Fuel Supply Tube is characterized by several key features:

• Robust material composition designed to resist corrosion and wear.
• Precise engineering to ensure a snug fit within the fuel system.
• A smooth interior to facilitate efficient fuel flow.
• Reinforced sections to withstand high pressure and flexible segments to accommodate movement within the truck’s chassis ².

Benefits

The benefits of this part include:

• Enhanced fuel delivery, ensuring the engine receives the precise amount of fuel needed for optimal performance.
• Increased reliability, reducing the likelihood of fuel system failures in demanding commercial applications.
• Durability and resistance to wear, prolonging its service life and providing value to truck operators ².

Troubleshooting and Maintenance

Common issues with the 3944458 Fuel Supply Tube may include leaks, blockages, or damage due to wear and tear. Troubleshooting steps involve inspecting the tube for visible signs of damage, checking for proper connection to the fuel system, and ensuring there are no obstructions within the tube. Regular maintenance practices, such as cleaning the tube and inspecting for wear, can help prevent issues and ensure optimal performance. It is also important to follow manufacturer guidelines for replacement intervals to maintain system integrity ².

About Cummins

Cummins is a leading manufacturer with a long-standing reputation for producing high-quality automotive components. The company’s history is marked by innovation and a commitment to excellence in the design and production of engine parts, including fuel system components like the 3944458 Fuel Supply Tube. Cummins’ dedication to quality and performance ensures that their products meet the rigorous demands of commercial truck applications ².

Cummins Engine Compatibility with Fuel Supply Tube Part 3944458

This part is designed to fit a variety of Cummins engines, ensuring a seamless integration into the engine’s fuel system. It is critical for maintaining the integrity of the fuel supply line, which is essential for the engine’s performance and longevity.

Compatible Engines

QSB Series:

• QSB3.9 30 CM550
• QSB4.5 CM850(CM2850)
• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB6.7 CM850(CM2850)
• QSB7 CM2880 B117

QSC Series:

• QSC8.3 CM850(CM2850)
• QSC9 CM2250/QSL9 CM2250

ISB Series:

• ISB CM550
• ISB CM850

ISC Series:

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250

ISL Series:

• ISL CM2150
• ISL9 CM2150 SN
• ISL9 CM2250

QSL Series:

• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM850(CM2850)

Other Models:

• 4B3.9
• 6B5.9
• B4.5

Engine Grouping

The 3944458 Fuel Supply Tube is compatible with a broad range of Cummins engines, including the QSB, QSC, ISB, ISC, and ISL series. This part is engineered to fit seamlessly into the fuel systems of these engines, ensuring a reliable and efficient fuel supply. The compatibility extends to both older and newer models within these series, making it a versatile choice for maintenance and repair needs ².

Role of Part 3944458 Fuel Supply Tube in Engine Systems

The 3944458 Fuel Supply Tube is an integral component within the fuel system of various engine setups, ensuring a consistent and reliable flow of fuel from the fuel tank to the engine. This component interfaces with several key elements of the fuel system, facilitating efficient engine operation.

Integration with Fuel System Components

1. Fuel Transfer: The Fuel Supply Tube is directly connected to the fuel pump, which draws fuel from the tank. It serves as a conduit, transferring fuel under pressure from the pump to the engine’s fuel injectors or carburetor.

2. Fuel Filter Connection: Before reaching the engine, fuel passes through a fuel filter to remove impurities. The Fuel Supply Tube is often connected to the inlet side of the fuel filter, ensuring that clean fuel is delivered to the engine components.

3. Plumbing and Accessories: Within the fuel system, the Fuel Supply Tube is part of the plumbing that connects various accessories. This includes connections to fuel pressure regulators, fuel rails in fuel-injected engines, and other accessories that manage fuel delivery and pressure.

4. Location and Routing: The positioning of the Fuel Supply Tube is strategic, routed to avoid heat sources and mechanical interference. Its location is critical for maintaining the integrity of the fuel as it travels from the tank to the engine.

5. Fuel System Efficiency: By providing a dedicated pathway for fuel, the Fuel Supply Tube helps maintain system pressure and reduces the risk of fuel starvation, which is essential for consistent engine performance ¹.

Conclusion

In summary, the 3944458 Fuel Supply Tube plays a significant role in the fuel delivery process, interacting with the fuel pump, filter, and various system accessories to ensure that the engine receives a steady supply of clean, pressurized fuel. Its robust design, compatibility with a wide range of Cummins engines, and critical role in maintaining fuel system integrity make it an essential component for optimal engine performance and longevity ².