Dorman 904-5301 Diesel Exhaust Fluid (DEF) Filler Cap

Durable Diesel Exhaust Fluid Filler Cap for Ford Vehicles

The Dorman 904-5301 Diesel Exhaust Fluid (DEF) Filler Cap is designed specifically for select Ford models, including the F-150, F-250 Super Duty, F-350 Super Duty, E-350 Super Duty, and Transit series. Constructed from durable blue plastic, this DEF filler cap ensures a secure seal and reliable performance in emission control systems.

• Made from high-quality blue plastic for durability and corrosion resistance
• Specific fitment for Ford E-350 Super Duty, F-150, F-250 Super Duty, F-350 Super Duty, and Transit models
• Includes a retention ring for secure installation
• Designed to maintain proper DEF system pressure and prevent contamination
• Part number 904-5301 ensures exact replacement compatibility

Product Details and Specifications

This Dorman DEF filler cap (part number 904-5301) is engineered to meet the exact specifications required by Ford diesel vehicles. The blue plastic housing is resistant to chemicals and environmental factors, helping to protect the DEF tank from leaks and contamination. The included retention ring provides a secure fit, preventing accidental loosening during vehicle operation. This cap is a specific replacement part, not a universal fit, ensuring proper sealing and compatibility with the DEF system on Ford E-350 Super Duty, F-150, F-250 Super Duty, F-350 Super Duty, and Transit models including Transit-150, Transit-250, Transit-350, Transit-350 HD, and Transit Custom.

Common Applications and Problem Resolution

• Prevents DEF fluid contamination from dirt and debris
• Maintains proper pressure within the DEF tank system
• Replaces damaged or missing DEF filler caps
• Helps avoid DEF fluid leaks that can trigger emission system warnings
• Ensures compliance with emission control hardware requirements

Installation Notes and Tips

Installation of the Dorman 904-5301 DEF filler cap is straightforward and requires no special tools. Before installation, clean the DEF filler neck to remove any dirt or residue. Align the cap and retention ring properly to ensure a secure fit. Tighten the cap until it clicks or seats firmly to prevent leaks. Regular inspection of the cap during routine maintenance is recommended to ensure continued proper sealing.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-5301 DEF filler cap undergoes quality checks to ensure durability and reliable performance in emission control systems. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to the product packaging or Dorman’s official documentation for exact warranty terms.