Dorman 577-866 Fuel Tank Filler Neck

Overview of Dorman Fuel Tank Filler Neck 577-866

The Dorman 577-866 fuel tank filler neck is designed for reliable fuel delivery in Chevrolet and GMC trucks. Engineered from durable steel, this black fuel filler neck ensures a secure connection for your fuel system, compatible with both gas and diesel fuels.

• Constructed from corrosion-resistant steel for long-lasting durability
• Compatible with Chevrolet Sierra 1500, Sierra 1500 Classic, Silverado 1500, and Silverado 1500 Classic models
• Measures 11 inches in length with a 31.8 mm outside diameter
• Includes one vent line with an 8 mm inside diameter made of steel
• Does not include hose, mounting hardware, or fuel cap
• Features a twist-type cap interface for secure sealing

Detailed Product Description

The Dorman 577-866 fuel tank filler neck is manufactured from high-quality steel, providing resistance to wear and corrosion commonly encountered in fuel system components. Its 11-inch length and 31.8 mm outside diameter are designed to match OEM specifications for a precise fit. The integrated vent line, constructed from steel with an 8 mm inside diameter, supports proper fuel tank ventilation, helping to maintain fuel system pressure and prevent vapor lock. This part is specifically engineered for use with gasoline and diesel fuels, making it suitable for a range of applications within Chevrolet and GMC full-size pickup trucks.

Compatible Vehicles and Applications

• Chevrolet Sierra 1500 (including Classic models)
• GMC Sierra 1500 (including Classic models)
• Chevrolet Silverado 1500 (including Classic models)
• GMC Silverado 1500 (including Classic models)

This fuel filler neck is ideal for replacing worn or damaged filler necks that cause fuel leaks, poor fuel flow, or ventilation issues.

Common Issues Addressed by This Fuel Tank Filler Neck

• Fuel leaks around the filler neck area
• Difficulty refueling due to damaged or corroded filler neck
• Fuel system ventilation problems causing pressure build-up
• Corrosion or rust compromising fuel system integrity
• Replacement of cracked or bent filler neck components

Installation Notes and Tips

Installation requires removal of the old filler neck and proper alignment with the fuel tank inlet. Since mounting hardware and hoses are not included, ensure existing components are in good condition or replaced as needed. Verify the vent line is securely attached to maintain proper fuel tank ventilation. Use appropriate tools to tighten the twist-type cap interface to prevent fuel vapor leaks.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. While specific warranty details for part number 577-866 are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to official Dorman documentation for complete warranty information.