3990099
Filler Cap
Cummins®

The Cummins 3990099 Filler Cap is a component designed for use in commercial trucks equipped with Cummins engines. Its purpose is to provide a secure and reliable means of accessing the fuel tank for refueling. This part plays a role in maintaining the integrity of the fuel system by preventing contaminants from entering the fuel tank and ensuring that fuel is not lost due to spills or evaporation ¹.

Basic Concepts of Filler Caps

A filler cap is a closure device used on the fuel tank of a vehicle to allow for the addition of fuel while preventing the escape of fuel vapors and the ingress of contaminants. It operates by creating a seal when closed, which maintains the pressure within the fuel tank and prevents fuel from leaking out. The secure and reliable operation of a filler cap is important for the efficient and safe functioning of a vehicle’s fuel system ².

Purpose of the Cummins 3990099 Filler Cap

The Cummins 3990099 Filler Cap is specifically designed to facilitate the refueling process in trucks by providing a secure point of entry into the fuel tank. It maintains the cleanliness of the fuel by preventing dust, dirt, and other contaminants from entering the tank during refueling. Additionally, it ensures the security of the fuel tank by creating a seal that prevents fuel vapors from escaping, which contributes to the overall efficiency and environmental compliance of the vehicle ³.

Key Features

The Cummins 3990099 Filler Cap is characterized by its robust design and the use of high-quality materials that ensure durability and long-term performance. It incorporates sealing mechanisms that provide a tight seal when closed, minimizing the risk of fuel leaks and vapor escape. The cap is also designed for ease of use, allowing for quick and secure opening and closing during the refueling process ⁴.

Benefits

Using the Cummins 3990099 Filler Cap offers several advantages, including enhanced fuel system security through its sealing capabilities, ease of use for the operator, and durability that ensures long-term performance. Its design and materials contribute to its resistance against wear and environmental factors, ensuring reliable operation over the vehicle’s lifespan. Moreover, its compatibility with Cummins engines ensures that it meets the specific requirements and standards set by the engine manufacturer ⁵.

Troubleshooting and Maintenance

Common issues with filler caps may include leaks or difficulty in opening or closing. These issues can often be resolved by inspecting the cap for damage, ensuring that the sealing surfaces are clean and free from debris, and verifying that the cap is properly seated on the fuel tank. Regular maintenance, such as cleaning the cap and its sealing surfaces, can help ensure the longevity and proper function of the filler cap ⁶.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions control technologies. With a history spanning over a century, Cummins has established itself as a trusted name in the commercial truck industry, known for its commitment to quality, innovation, and customer satisfaction. The company’s focus on engineering excellence and customer-centric solutions has made it a preferred choice for engine and component manufacturing in the commercial vehicle sector ⁷.

Conclusion

The Cummins 3990099 Filler Cap is an essential component for maintaining the efficiency and safety of the fuel system in commercial trucks. Its robust design, ease of use, and compatibility with Cummins engines make it a reliable choice for operators and maintenance personnel. Regular maintenance and proper use of this part can ensure the longevity and performance of the fuel system, contributing to the overall efficiency and environmental compliance of the vehicle.