Dorman 55811 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring for Ford and Mercury

Dorman 55811 is a steel 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, Mercury, and Lincoln applications, including Ford F-150, Ford Bronco, Ford Explorer, Mercury Cougar, and Lincoln Town Car models. Dorman 55811 is built for direct replacement use where a 3.875 in. I.D. retainer is required.

Key Features

• Steel construction for durable service in fuel system applications
• Secures the fuel pump assembly to the tank lock opening
• Includes gasket or seal for service replacement
• Recommended whenever the sending unit is removed or serviced
• Direct-fit style for many Ford, Mercury, and Lincoln vehicles

Detailed Description

This fuel tank sending unit lock ring is used to retain the sending unit or fuel pump module at the top of the fuel tank. Dorman 55811 is a practical replacement for worn, corroded, or damaged retainers on vehicles such as the Ford F-150, Ford Bronco, Ford Ranger, Mercury Mystique, and Lincoln Town Car. The steel construction supports reliable retention, while the included seal helps complete the service correctly. This part cross-references 558103 and E1VZ9417B for the same application.

What It Helps Fix

• Loose or damaged fuel pump module retention
• Fuel odor caused by a compromised tank seal area
• Corrosion on the original sending unit retainer
• Improper sealing after fuel sender service
• Fitment issues on vehicles using a 3.875 in. I.D. lock ring

Installation Notes and Tips

Verify tank opening diameter and application before installation. Clean the sealing surface thoroughly, inspect the sending unit flange, and replace the retainer whenever the fuel pump assembly is serviced. Confirm the vehicle-specific fitment for your Ford Escort, Ford Thunderbird, Mercury Cougar, or other listed application before final assembly.

Quality Assurance

Dorman manufactures replacement hardware for automotive repair applications with attention to fit and serviceability. Part number 55811 is built as a service replacement for the fuel tank sending unit retainer used across many Ford, Mercury, and Lincoln models.