Dorman 579-001 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring

Dorman 579-001 is a metal fuel tank sending unit lock ring used to secure the fuel pump assembly to the tank opening. It is recommended for replacement whenever the sending unit is serviced, helping restore a tight, reliable retention point on a wide range of GM and Cadillac applications.

Built for direct replacement service, this lock ring is sized for 3.03-inch inside diameter applications and includes a gasket or seal for service work where the sending unit is removed. It is a practical choice for fuel tank sending unit lock ring replacement on Chevrolet C1500, GMC K1500, Cadillac Escalade, and other listed vehicles.

Key Features

• Metal construction for durable fuel system service
• 3.03-inch inside diameter application coverage
• Lock ring diameter: 3.125 in.
• Includes gasket or seal for service replacement
• Direct-fit fuel pump lock ring for twist-on cam style applications
• Brand part number: 579-001

Detailed Description

Dorman 579-001 is a fuel tank sending unit lock ring designed to retain the fuel pump or sending unit assembly at the tank opening after service. It is commonly used on GM trucks, SUVs, and passenger cars with 3.03-inch inside diameter fuel tank openings, including Chevrolet C2500, GMC Yukon, Pontiac Bonneville, and Cadillac DeVille applications. This part cross-references Spectra Premium LO01 for the same application.

The metal construction supports dependable retention during fuel system repair, while the included gasket or seal helps complete the service at the tank interface. For technicians and DIY repair work, this lock ring is a straightforward replacement when servicing the sending unit on vehicles such as the Chevrolet Tahoe, GMC Safari, and Pontiac Firebird.

What It Helps Fix

• Loose or damaged fuel pump retaining ring
• Fuel tank sending unit not seating securely
• Fuel odor from a poor tank seal after service
• Improper retention after pump or sender replacement
• Corrosion or wear at the original lock ring

Installation Notes and Tips

Verify the tank opening diameter and twist-on cam style before installation. Clean the sealing surface thoroughly, inspect the sender flange, and replace the lock ring whenever the sending unit is serviced. Confirm the application against the vehicle listing for Chevrolet C1500, GMC K2500, and Cadillac Escalade models before assembly.

Quality Assurance

Dorman manufactures replacement hardware for fuel system service with application-specific fitment and durable materials. Part number 579-001 is built for direct replacement use on the listed vehicles and fuel tank configurations.