Restore your 2004 Ford Mustang's fuel system integrity with this premium replacement gas cap, specifically engineered for optimal air and fuel delivery performance. This OEM-quality cap ensures a perfect seal to maintain proper fuel tank pressure, preventing fuel evaporation and keeping contaminants out while allowing your engine to breathe efficiently. Built to withstand years of daily use with durable materials that resist cracking, fading, and weathering, this gas cap features the exact threading and locking mechanism your Mustang requires for a secure, leak-free fit. Don't let a faulty gas cap trigger your check engine light or compromise your fuel economy – this direct replacement part installs in seconds and delivers the reliable performance your classic pony car deserves, all while maintaining that authentic Ford quality and finish that matches your Mustang's original specifications.