Dorman 577-379 Fuel Filler Neck - Upper

Overview of Dorman Fuel Tank Filler Neck 577-379

The Dorman 577-379 fuel tank filler neck is designed for reliable fuel delivery in select GM vehicles. Constructed from durable steel, this filler neck ensures a secure connection between the fuel cap and the fuel tank for Buick, Chevrolet, GMC, and Oldsmobile models.

• Made from corrosion-resistant steel for long-lasting durability
• 33-inch length suitable for specific GM SUV models
• 1.125-inch inside diameter fill pipe for proper fuel flow
• Includes 1 filler neck and 1 ground wire for installation
• Fuel cap not included

Detailed Product Description

The Dorman 577-379 fuel tank filler neck is engineered to meet the specifications required by Buick Bravada, Chevrolet Trailblazer, GMC Envoy, and Oldsmobile Rainier vehicles. Its 33-inch steel construction provides strength and resistance to wear, while the 1.125-inch inside diameter fill pipe ensures efficient fuel transfer during refueling. The included ground wire helps maintain proper electrical grounding, which is essential for vehicle safety and fuel system performance. This part does not include a fuel cap, so the existing cap should be reused or replaced separately if needed.

Common Applications and Issues Addressed

• Replacement for cracked or damaged filler necks causing fuel leaks
• Fixes issues with improper fuel flow during refueling
• Resolves fuel odor problems due to faulty filler neck seals
• Addresses grounding issues that may trigger fuel system warnings
• Restores secure connection between fuel cap and tank

Installation Notes and Tips

• Ensure vehicle compatibility with Buick Bravada, Chevrolet Trailblazer, GMC Envoy, or Oldsmobile Rainier before installation
• Use proper tools to remove the old filler neck and ground wire carefully
• Inspect the fuel cap and replace if worn, as it is not included with this part
• Verify the ground wire connection is secure to maintain electrical safety
• Check for fuel leaks after installation and test refueling operation

Quality Assurance and Warranty

Dorman manufactures the 577-379 fuel tank filler neck to meet or exceed OEM standards for fit, form, and function. The steel material offers corrosion resistance and durability under normal operating conditions. While specific warranty details may vary, Dorman typically provides a limited warranty covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.