Dorman 55810 Fuel Tank Sending Unit Lock Ring

Fuel Tank Sending Unit Lock Ring for GM Applications

Dorman 55810 is a steel fuel tank sending unit lock ring built to secure the fuel pump or sending unit assembly to the tank opening. It includes a gasket seal and is recommended whenever the sending unit is serviced, helping restore a tight, reliable tank seal on many Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac vehicles.

For GM truck and SUV repairs, this lock ring is a direct-fit service part for common applications such as Chevrolet C1500, GMC K1500, and Chevrolet Tahoe. The Dorman 55810 part number is also a useful reference when replacing a worn or damaged sending unit retainer during fuel system service.

Key Features

• Steel construction for durable fuel tank service
• Secures the sending unit or fuel pump assembly to the tank
• Includes gasket or seal for a proper tank interface
• Replacement retainer for fuel tank sending unit service
• Fits many GM cars, trucks, vans, and SUVs from 1982-2002

Detailed Description

This fuel tank sending unit lock ring is used to retain the sending unit assembly at the tank opening, helping maintain a secure connection between the pump module and fuel tank. Dorman 55810 is made from steel for dependable service and is specified for applications with a 3.125-inch inner diameter in many GM platforms. It is a practical replacement when servicing the fuel system on vehicles such as Chevrolet S10, GMC Sonoma, Buick LeSabre, and Pontiac Bonneville.

This part cross-references 558113 and 22515965 for the same application.

What It Is Used For

• Replacing a damaged or corroded fuel tank sending unit retainer
• Restoring a secure seal after fuel pump or sending unit service
• Addressing fuel odor caused by a poor tank opening seal
• Correcting loose or improperly retained sending unit assemblies
• Supporting fuel system repairs on GM trucks, SUVs, and passenger cars

Installation Notes and Tips

Verify tank opening diameter and application details before installation. Clean the tank flange and sealing surface thoroughly, then install the gasket and retainer according to the vehicle service procedure. Because this part is used in fuel system service, follow proper fuel safety practices and relieve fuel pressure before beginning work.

Compatible With many 1982-2002 GM applications, including Chevrolet C1500, Chevrolet Tahoe, GMC K1500, Buick LeSabre, and Pontiac Bonneville. Body fitment should be confirmed against the exact year, make, and model listed for the vehicle.

Quality Assurance

Dorman supplies replacement hardware for fuel system repairs with application-specific fitment and material selection. Part number 55810 is built as a service replacement for vehicles that require a steel sending unit lock ring and gasket seal.