Dorman 904-065 Diesel Exhaust Fluid (DEF) Filler Neck

Dorman 904-065 DEF Filler Neck

Dorman 904-065 is a diesel exhaust fluid (DEF) filler neck for specified Ford Super Duty diesel applications. It matches the original neck’s fit to restore secure DEF transfer from the fill point to the DEF tank when the OE part is leaking or has failed.

Key Features

• Direct replacement DEF filler neck for emission control service
• Built with steel, plastic, and rubber materials for the specified application
• Black finish for a factory-style appearance
• Bolt-on attachment method for OE-style mounting
• Fits 2011-2016 Ford F-350 Super Duty, w/Aft Axle Fuel Tank Only
• Part number 904-065 for catalog and service reference

Detailed Description

This DEF filler neck is engineered for 2011-2016 Ford F-350 Super Duty trucks with the aft axle fuel tank only. It follows the original shape and mounting style to help maintain a secure path for DEF during refueling and reduce issues caused by a cracked, leaking, or damaged filler neck. Dorman 904-065 is a practical OE-style replacement for emission system repair on the Ford F-350 Super Duty platform.

This part cross-references Ford BC3Z5J232D for the same application.

Common Issues It May Solve

• DEF leakage at the filler neck
• Cracks or failure in the original filler neck assembly
• Loose or insecure DEF transfer during refueling
• Damage to the fill path between the filler point and DEF tank
• Emission system service needs on Ford F-350 Super Duty diesel trucks

Installation Notes and Tips

• Compatible With 2011-2016 Ford F-350 Super Duty, w/Aft Axle Fuel Tank Only.
• Verify the vehicle uses the aft axle fuel tank configuration before ordering.
• Inspect surrounding DEF hoses, seals, and mounting points during replacement.
• Confirm the part number 904-065 against the original component and vehicle build details.

Quality Assurance

Dorman manufactures replacement emission components to match original fit and function for specified applications. This part is intended as a direct-fit service replacement for the listed Ford Super Duty configuration.