Dorman 579-042 Fuel Tank Sending Unit Lock Ring

Dorman 579-042 Fuel Tank Sending Unit Lock Ring

Dorman 579-042 is a fuel tank sending unit lock ring made to secure the fuel pump assembly to the tank opening during service. Built from steel and rubber, it is a direct-fit replacement for applications that require a reliable retaining ring and seal support.

Compatible with 1957-1960 Ford Thunderbird fuel tank sending unit service, this lock ring is recommended whenever the sending unit is removed or replaced. The included gasket or seal helps support a proper reseal at the tank opening.

Key Features

• Fuel tank sending unit lock ring for retaining the fuel pump assembly
• Steel and rubber construction for durable service
• Includes gasket or seal for service replacement
• Inside diameter: 1.9 in
• Outside diameter / lock ring diameter: 2.67 in
• Dorman 579-042 replacement part for fuel tank service

Detailed Description

This Dorman fuel tank sending unit lock ring is used to hold the sending unit and fuel pump assembly securely in place at the tank opening. It is a practical replacement when servicing the fuel system on a 1957-1960 Ford Thunderbird, where a worn or damaged retaining ring can affect sealing and retention. The steel and rubber construction supports dependable fitment, while the included seal helps complete the service at the tank interface. This part cross-references Spectra Premium LO42 for the same application. Dorman 579-042 is a service-focused replacement for technicians and owners addressing fuel tank sending unit retention on Ford Thunderbird models from 1957 through 1960.

What It Helps Fix

• Loose or damaged fuel pump/sending unit retention at the tank opening
• Fuel odor caused by a compromised sending unit seal area
• Service issues after removing the sending unit for repair or inspection
• Improper seating of the fuel pump assembly in the tank
• Corrosion-related wear on the original lock ring

Installation Notes

Install during fuel tank sending unit service and verify the ring seats evenly before returning the vehicle to service. Inspect the tank flange, seal surface, and sending unit alignment before tightening. Confirm dimensions and application match the original hardware for the 1957-1960 Ford Thunderbird. Dorman 579-042 should be used with the correct sending unit setup for the vehicle.

Quality Assurance

Dorman manufactures replacement hardware for fuel system service using durable materials selected for reliable fit and function. Part number 579-042 is built as a service replacement for sending unit retention on the specified Ford Thunderbird applications.