Dorman 579-011 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring for Ford Applications

Dorman 579-011 is a fuel tank sending unit lock ring made for secure retention of the fuel pump assembly at the tank opening. Built from durable rubber and supplied with a gasket or seal, it supports a proper service replacement when the sending unit is removed or serviced.

Compatible With Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis, Ford F-250 Super Duty, Ford F-350 Super Duty, Ford Mustang, and Mercury Marauder applications across the listed model years. This Dorman 579-011 lock ring is a direct-fit service part for fuel tank sending unit repair work.

Key Features

• Fuel tank sending unit lock ring for retaining the fuel pump assembly
• Durable rubber construction for service use
• Inside diameter: 4.61 in; outside diameter: 6.56 in
• Lock ring diameter: 4.5 in
• Gasket or seal included
• Mounting hardware included
• Cross-reference: Ford 5W1Z9276A and Spectra Premium LO57

Detailed Description

Dorman 579-011 is used to secure the fuel pump and sending unit assembly to the fuel tank lock opening after service. It is a practical replacement for vehicles that require a new retaining ring during fuel system repair, including Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis models, as well as select Ford F-250 Super Duty, Ford F-350 Super Duty, Ford Mustang, and Mercury Marauder applications. The included seal supports a proper tank interface, while the ring dimensions help match the original service location.

This part cross-references Ford 5W1Z9276A and Spectra Premium LO57 for the same application.

What It Helps Fix

• Loose or damaged fuel tank sending unit retention
• Fuel pump assembly movement at the tank opening
• Seal issues at the sending unit service area
• Corrosion or wear on the original lock ring
• Service-related replacement needs during fuel pump or sender repair

Installation Notes and Tips

Install the lock ring during fuel tank sending unit service and verify the seal seats evenly before final assembly. Confirm the ring diameter and tank opening match the original hardware on your Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis, or other listed application before installation. Clean the mating surfaces to help the ring and seal seat correctly.

Quality Assurance

Dorman manufactures replacement hardware for automotive repair applications, and this lock ring is built from durable materials for reliable service. Use it as a service replacement whenever the sending unit is removed or replaced.