Spectra FN724 Fuel Filler Neck

Spectra FN724 Fuel Tank Filler Neck

The Spectra FN724 fuel tank filler neck is an OE-style replacement for select Chevrolet and GMC trucks and vans with rear tank applications. It is built to match original equipment performance requirements for a direct-fit fuel storage repair.

• Fuel tank filler neck for air and fuel delivery repairs
• OE-style replacement engineered to meet or exceed original equipment performance
• Application-specific fitment for rear tank configurations with screw cap and one vent
• Cross-reference part number: 577243
• Part number FN724 for catalog and fitment lookup

Detailed Fitment and Application

Compatible with 1988-2000 Chevrolet C3500 and K3500 rear tank applications, 3-3/4 in., with 1 vent and screw cap, except NM8 (Leaded Fuel Emission System). It also fits 1988-2000 GMC C3500 and K3500 rear tank applications with the same configuration, plus 1993-1996 Chevrolet G30 and GMC G3500 models with 3-3/4 in. filler neck sizing, one vent, and screw cap. Use FN724 when replacing a worn, rusted, or leaking filler neck on these Chevrolet C3500, GMC K3500, and related applications.

Common Repair Uses

• Fuel odor caused by a cracked or corroded filler neck
• Fuel leakage around the tank inlet area
• Difficulty refueling from a damaged neck or vent path
• Rust or physical damage on the original filler tube
• Restoring proper fuel transfer to the rear tank

Installation Notes

Verify rear tank configuration, 3-3/4 in. neck size, one vent, and screw cap style before installation. Confirm the vehicle is not equipped with NM8 leaded fuel emission system hardware where excluded. Inspect adjoining hoses, seals, and mounting points during replacement to ensure a proper fuel system repair.

Quality Assurance

Spectra Premium fuel filler necks are engineered and manufactured with quality control processes intended to match original equipment performance standards. FN724 is built as a direct replacement for the listed Chevrolet and GMC applications.