Dorman 579-204 Fuel Tank Lock Ring

Dorman Fuel Tank Lock Ring for Mazda Applications

Dorman 579-204 is a direct replacement fuel tank lock ring for servicing the fuel sending unit. Built from durable plastic and rubber materials, it is made for a secure fit and reliable sealing performance on select Mazda vehicles.

Key Features

• Direct-match fuel tank lock ring for original equipment-style fit
• Constructed from plastic and rubber for dependable service
• Includes an O-ring seal for proper sealing at the tank opening
• White finish for easy identification during service
• Lock ring diameter: 6.5 in; inside diameter: 5.35 in; outside diameter: 7 in
• Rim width and thickness: 0.088 in

Detailed Description

This Dorman fuel tank lock ring is a practical replacement when the sending unit is removed or serviced. Part number 579-204 is engineered as a direct match to the original component, helping restore a secure connection between the fuel tank and sending unit assembly. It is a fitment-based solution for Mazda 2, Mazda RX-8, Mazda 3, and Mazda 6 applications listed below. This part cross-references Spectra Premium LO184 for the same application.

Compatible With 2011-2014 Mazda 2, N/A; 2009-2011 Mazda RX-8, N/A; 2006-2009 Mazda 3, N/A; 2006-2007 Mazda 6, N/A; and 2004-2005 Mazda 3, N/A Federal Emissions. Dorman 579-204 is designed for service work where the original lock ring has worn, distorted, or no longer seats correctly.

What It Helps Address

• Fuel odor caused by a poor seal at the sending unit opening
• Difficulty securing the fuel tank sender after service
• Damaged, corroded, or deformed original lock ring hardware
• Sealing issues after fuel pump or sending unit replacement
• Fitment concerns when replacing a worn OE-style retaining ring

Installation Notes and Tips

Use this lock ring during fuel tank sending unit service on the listed Mazda models. Inspect the tank flange and sealing surface before installation, and replace any damaged components that could prevent the ring from seating evenly. Confirm the O-ring is positioned correctly before tightening the ring into place. Verify application details by year, model, and emissions note before ordering.

Quality Assurance

Dorman manufactures this replacement lock ring from durable materials for reliable service and a secure fit. Part number 579-204 is built as a direct replacement for the original part and includes the sealing O-ring specified in the product contents.