A fuel tube filler neck includes a first thread is formed on an inner surface and a second thread formed on an outer surface. The first thread, second thread, and tube may be co-molded of thermoplastic (e.g., nylon) and the first and second thread may overlap one another. The outer surface includes a cylindrical portion and a recessed portion, the second thread being formed on the recessed portion. Attachment structures are secured to the fuel tube for mounting the fuel tube to a fuel tank. A first type of fuel cap is engaged with the first thread and a second type of fuel cap is engaged with the second thread. Vehicles with different types of fuel caps may be shipped to different geographic regions.