Dorman 579-019 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring for Nissan and INFINITI

Dorman 579-019 is a 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, and it includes a gasket or seal for a proper service fit. This Dorman 579-019 lock ring is built from steel and rubber for dependable retention in fuel system applications.

Key Features

• Steel and rubber construction for durable fuel tank service
• Secures the fuel pump assembly to the tank opening
• Includes gasket or seal for service replacement
• Inside diameter: 4.375 in; outside diameter: 5.12 in
• Lock ring diameter: 6.22 in
• Compatible with select Nissan 350Z, 370Z, GT-R, Frontier, Pathfinder, Maxima, Xterra, Sentra, and INFINITI Q50, Q60, Q70, QX50, QX70, G35, G37, FX35, FX45, FX50, M35, and M45 applications

Detailed Description

This fuel tank sending unit lock ring is a direct service part for retaining the fuel pump or sending unit assembly at the tank flange. Dorman 579-019 is a practical replacement when servicing the fuel system on vehicles such as the Nissan 350Z, Nissan GT-R, INFINITI G35, and INFINITI QX50. The steel-and-rubber construction supports reliable clamping at the tank opening, while the included seal helps complete the service. This part cross-references Spectra Premium LO165 for the same application.

What It Helps Fix

• Loose or damaged fuel pump retaining ring
• Fuel odor from a poor seal at the sending unit opening
• Fuel pump assembly movement at the tank flange
• Service issues after fuel sender or pump replacement
• Corrosion or wear on the original lock ring

Installation Notes and Tips

• Use during fuel pump or sending unit service when the original ring is worn, distorted, or corroded.
• Confirm the tank opening diameter and lock ring dimensions before installation.
• Inspect the sealing surface and replace damaged components before reassembly.
• Follow vehicle service procedures for fuel system depressurization and safe handling.
• Verify fitment for the exact year, make, and model, including fuel pump applications on select INFINITI and Nissan vehicles.

Quality Assurance

Dorman manufactures replacement hardware for automotive repair applications, and this part is built from durable materials for reliable service. Part number 579-019 is engineered for the listed Nissan and INFINITI fitments and is a service replacement for fuel tank sending unit retention.