4991976
Fuel Supply Tube
Cummins®

Introduction

The Cummins 4991976 Fuel Supply Tube is a component designed for use in the fuel delivery system of heavy-duty trucks. Its role is to facilitate the consistent and efficient transfer of fuel from the tank to the engine. This part is integral to maintaining the operational integrity of the fuel system, ensuring that the engine receives a steady supply of fuel under various driving conditions.

Purpose and Function

The Cummins 4991976 Fuel Supply Tube serves a role in the fuel delivery system by providing a conduit for fuel to travel from the fuel tank to the engine. It ensures that fuel is delivered consistently and at the correct pressure, which is necessary for optimal engine performance. The tube is designed to withstand the pressures and temperatures associated with fuel delivery in heavy-duty applications, contributing to the overall efficiency and reliability of the truck’s fuel system ¹.

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 performance, such as precise engineering to ensure a proper fit within the fuel system and smooth internal surfaces to minimize fuel flow resistance. These characteristics contribute to the tube’s ability to perform reliably in demanding environments ².

Benefits

Utilizing the Cummins 4991976 Fuel Supply Tube can lead to several advantages. It supports improved fuel efficiency by ensuring that fuel is delivered to the engine without unnecessary loss or restriction. This consistent fuel flow can enhance engine performance, allowing for more power and better responsiveness. Additionally, the tube’s robust construction and design contribute to increased reliability, even under the strenuous conditions typical of heavy-duty truck operations ³.

Installation and Compatibility

Proper installation of the Cummins 4991976 Fuel Supply Tube is important for its effective function within the fuel system. Installation guidelines should be followed to ensure that the tube is securely fitted and properly aligned with other components. Compatibility with various Cummins engine models and other relevant components should be verified to ensure seamless integration into the fuel system.

Maintenance and Troubleshooting

Routine maintenance of the Cummins 4991976 Fuel Supply Tube is recommended to ensure its longevity and optimal performance. This may include regular inspections for signs of wear or damage and ensuring that all connections are secure. Common issues that may arise include fuel leaks or restrictions in fuel flow, which can often be addressed by inspecting and, if necessary, replacing the tube or associated components.

Safety Considerations

When handling and working with the Cummins 4991976 Fuel Supply Tube, it is important to observe safety precautions. This includes proper handling procedures to avoid damage to the tube and awareness of the potential hazards associated with fuel systems, such as fuel spills or the risk of fire. Safety equipment and procedures should be in place during installation and maintenance to protect against these risks.

Cummins Overview

Cummins Inc. is a well-established company in the automotive industry, known for its high-quality components for heavy-duty trucks. With a history of innovation and a commitment to excellence, Cummins has built a reputation for producing reliable and efficient parts that meet the demanding requirements of commercial and industrial applications. The company’s dedication to quality is evident in its wide range of products, including the Cummins 4991976 Fuel Supply Tube.

Compatibility with Cummins Engines

The Cummins Fuel Supply Tube part number 4991976 is designed to fit a variety of Cummins engines, ensuring a secure and efficient fuel delivery system. This part is integral to the proper functioning of the fuel system in these engines, facilitating the transfer of fuel from the fuel tank to the engine’s fuel injection system.

ISB and ISBE Series

• ISB CM2150
• ISB/ISD6.7 CM2150 SN
• ISBE CM2150

ISB6.7 Series

• ISB6.7 CM2250
• ISB6.7 CM2350 B101

ISBE4 Series

• ISBE4 CM850

QSB Series

• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

By ensuring compatibility with these engines, the Cummins Fuel Supply Tube part 4991976 plays a role in maintaining the performance and reliability of the engine’s fuel system.

Role of 4991976 Fuel Supply Tube in Engine Systems

The 4991976 Fuel Supply Tube is an integral component in the fuel delivery system of an engine. Its primary function is to transport fuel from the fuel tank to the fuel injectors or carburetor, ensuring a consistent and reliable fuel supply for combustion.

Integration with Fuel System Components

1. Fuel Tank: The Fuel Supply Tube connects directly to the fuel tank, drawing fuel through a pickup tube or filter sock. This ensures that any contaminants are filtered out before the fuel enters the tube.
2. Fuel Pump: Positioned downstream from the fuel tank, the fuel pump increases the pressure of the fuel as it moves through the Fuel Supply Tube. This pressurized fuel is then directed towards the engine’s fuel injectors or carburetor.
3. Fuel Filter: Before reaching the engine, the fuel passes through a fuel filter. The Fuel Supply Tube facilitates this by providing a conduit that allows the filtered fuel to move efficiently from the filter to the next component in the system.
4. Fuel Injectors: In modern engines equipped with fuel injection systems, the Fuel Supply Tube delivers fuel to the fuel rail, which distributes it to individual fuel injectors. Each injector then sprays a precise amount of fuel into the combustion chamber.
5. Carburetor: In older engines or those designed with carburetors, the Fuel Supply Tube feeds fuel directly into the carburetor. The carburetor then mixes the fuel with air before the mixture enters the combustion chamber.
6. Fuel Pressure Regulator: Some systems incorporate a fuel pressure regulator, which may be connected via the Fuel Supply Tube. This regulator maintains consistent fuel pressure, ensuring optimal engine performance.
7. Fuel Return Line: In systems with a return line, excess fuel is sent back to the tank via a separate tube. The Fuel Supply Tube, however, is dedicated to delivering fuel to the engine, ensuring a one-way flow for efficient operation.

Plumbing Considerations

The Fuel Supply Tube must be correctly routed to avoid interference with other engine components and to minimize the risk of fuel leaks. Proper clamping and securing of the tube are essential to maintain system integrity. Additionally, the tube should be inspected regularly for signs of wear, corrosion, or damage to prevent potential failures.

Conclusion

In summary, the Cummins 4991976 Fuel Supply Tube plays a role in ensuring the smooth and efficient operation of the engine’s fuel system. Its proper installation and maintenance are key to the overall performance and reliability of the engine.