The Spectra Premium Industries, Inc. FN531 Fuel Filler Neck is engineered to provide a precise fit and reliable performance for diesel vehicles. Designed to meet or exceed original equipment specifications, this fuel filler neck ensures seamless integration and durability. Constructed from high-quality steel, it offers enhanced corrosion resistance, extending the service life of the component. The FN531 is rigorously leak-tested to prevent fuel and evaporative leaks, safeguarding both vehicle performance and environmental compliance. Its design includes a threaded cup with a 1.75-inch diameter, facilitating secure attachment and preventing fuel spillage. The inclusion of a vent with a 0.75-inch inside diameter ensures proper fuel tank ventilation, reducing the risk of pressure buildup and potential damage. This fuel filler neck is compatible with diesel fuel systems, aligning with the specific requirements of diesel engines. The FN531 is designed for easy installation, minimizing downtime and labor costs. Its robust construction and precise engineering make it a reliable choice for fleet operators seeking to maintain vehicle performance and safety standards.