Dorman 579-004 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring

Dorman 579-004 is a metal fuel tank sending unit lock ring made for secure retention of the fuel pump assembly at the tank opening. It is recommended for replacement whenever the sending unit is serviced, and it includes a gasket or seal for a proper service repair.

Compatible with a wide range of Ford, Lincoln, and Mercury applications, including Ford F-150, F-250, F-350, Bronco, and E-150 Econoline models that use a 3.625 in. lock ring diameter. Dorman 579-004 is built for direct-fit service on vehicles with the listed steel tank applications.

• Metal construction for durable service
• Lock ring diameter: 3.625 in.
• Inside diameter: 3.5 in.
• Outside diameter: 4.25 in.
• Gasket or seal included
• Direct replacement for fuel pump lock ring service

Detailed Product Overview

This fuel tank sending unit lock ring secures the fuel pump assembly to the tank opening and helps maintain a stable seal after service. It is a practical replacement for Ford F-150, Ford Bronco, and Ford F-250 fuel tank repairs where the original retaining ring has been removed, damaged, or no longer holds securely. The Dorman 579-004 also cross-references Spectra Premium LO04 and E0VZ9C385AA for the same application.

Common Repair Uses

• Loose or damaged fuel pump retaining ring
• Fuel tank sending unit service on Ford, Lincoln, and Mercury vehicles
• Seal replacement after fuel pump module removal
• Corroded or worn metal lock ring at the tank opening
• Restoring secure retention of the sending unit assembly

Installation Notes and Tips

Verify the tank style and lock ring diameter before installation. This part is listed for steel tank applications on many Ford trucks and vans, and the included gasket or seal should be inspected during service to confirm proper seating. Clean the tank flange and mating surfaces before installing the ring to help achieve a secure fit.

Quality Assurance

Dorman manufactures replacement hardware for fuel system service using durable materials selected for reliable operation. Part number 579-004 is specified as a service replacement for the listed applications and dimensions.