Dorman 55817 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring for Ford Applications

Dorman 55817 is a steel fuel tank sending unit lock ring used to secure the fuel pump and sending unit assembly at the tank opening. It is recommended whenever the sending unit is serviced, and it includes a gasket or seal for a proper reassembly.

Compatible with select Ford, Lincoln, and Mercury vehicles, including Ford Ranger, Ford Explorer, Ford Expedition, Lincoln Aviator, and Mercury Mountaineer applications. This Dorman 55817 retainer is built for direct replacement service where a secure tank-to-module lock ring is required.

Key Features

• Steel construction for durable service
• Fuel tank sending unit lock ring / retainer
• Gasket or seal included
• Recommended replacement during sending unit service
• Direct-fit service part for select Ford, Lincoln, and Mercury fuel systems

Detailed Description

This fuel tank sending unit lock ring secures the fuel pump assembly to the tank opening and helps maintain a tight, stable connection after service. The steel construction supports reliable retention, while the included gasket or seal helps complete the installation. Dorman 55817 is a practical replacement for vehicles that require a sending unit retainer during fuel tank repair or pump service. This part cross-references Spectra Premium LO180 for the same application.

Common Repair Uses

• Broken or corroded fuel tank lock ring
• Loose fuel pump module retention at the tank
• Fuel odor from a poor seal at the sending unit opening
• Service replacement after fuel pump or sending unit removal
• Reassembly on Ford Ranger, Ford Explorer, and related applications

Installation Notes and Tips

• Clean the tank flange and sealing surface before installation.
• Inspect the sending unit opening for damage or corrosion before fitting the retainer.
• Use the included gasket or seal during reassembly.
• Verify application details carefully for Ford Explorer, Ford Ranger, Expedition, Aviator, and Mountaineer fitment.
• Fitment includes 1998-2003 Ford Ranger, 2001-2002 Ford Explorer, 2002 Ford Explorer Sport, 2002 Mercury Mountaineer, 2002-2005 Ford Explorer Sport Trac, 2003 Ford Explorer Sport, 2003-2004 Ford Explorer, 2003-2004 Ford Expedition, 2003-2004 Mercury Mountaineer, and 2003-2005 Lincoln Aviator.

Quality Assurance

Dorman manufactures replacement hardware for service applications and supplies this lock ring as a durable steel retainer for fuel tank sending unit repair. Part number 55817 is built for dependable fitment on the listed vehicles.