Dorman 904-103 Fuel Injection Return Line Gasket Kit

Fuel Injection Return Line Gasket Kit for GM Trucks

Dorman 904-103 is a fuel injection return line gasket kit built to match the original sealing components used to repair the fuel line and restore proper pressure on specified vehicles. It is a direct-fit service kit for 2001-2004 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 applications.

With metal and rubber gasket and seal materials, this kit is made for service work where the return line seal has worn, leaked, or lost its ability to hold pressure. Dorman 904-103 supports a clean repair on Chevrolet Silverado 2500 HD and GMC Sierra 3500 fuel injection return line service.

Key Features

• Fuel injection return line gasket kit for specified GM heavy-duty trucks
• Metal and rubber gasket materials for sealing performance
• Metal and rubber seal materials for repair applications
• Direct replacement for OE-style fuel line service
• Designed for 2001-2004 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500
• Cross-references OE part number 97228933 for the same application

Detailed Description

Dorman 904-103 is a fuel injection return line gasket kit for service on select Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 models from 2001-2004. The kit uses metal and rubber sealing components to match the original repair requirements for the fuel line and help restore proper pressure after a seal failure. This part number, 904-103, is built for technicians and owners replacing worn return line gaskets on GM heavy-duty trucks.

As a Dorman service kit, this part is focused on restoring the sealing interface at the fuel injection return line rather than replacing the entire fuel system. It is a practical choice when the original gasket or seal has deteriorated and the vehicle needs a precise repair to maintain fuel pressure and reduce leakage at the connection point.

What It Helps Fix

• Fuel seepage at the injection return line connection
• Loss of fuel pressure caused by worn sealing surfaces
• Hard-start or drivability issues related to a leaking return line seal
• Service failures after removing and reinstalling the fuel line
• Seal deterioration on high-mileage Chevrolet Silverado 2500 HD and GMC Sierra 3500 trucks

Installation Notes and Tips

Inspect the return line, mating surfaces, and surrounding fuel system components before installation. Clean all sealing surfaces thoroughly and replace damaged hardware or corroded fittings as needed, since installation hardware is not included. Verify the vehicle application by year, make, and model before service, especially on 2001-2004 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 trucks.

Quality Assurance

Dorman manufactures this kit as an OE-style replacement service part for specified applications. The design follows the original component layout needed to complete the repair and restore proper fuel line sealing on the listed GM trucks.