The present invention relates to fuel vapor vent valves employed in vapor emission controls systems in motor vehicle fuel tank installations. The invention particularly relates to float operated vent valves attached to the upper wall of a non-metallic fuel tank. Valves employed for such applications are commonly mounted onto the tank through an access opening formed in the upper wall with portions of the valve extending outwardly over the opening and attached to the outer surface of the tank in a sealing arrangement, as for example, by weldment of compatible non-metallic material to the surface of the tank.
Heretofore the weldment has been by hot-plate or sonic welding techniques which have proven relatively costly in mass production. Heretofore, attempts to spin weld a fuel vapor vent valve of the present type have resulted in destruction of the valving surfaces by the extreme rotational accelerations and decelerations. Furthermore, proper or accurate orientation of the vent hose connector was not possible with spin welding. However, spin welding has been desired as a more cost effective way of attaching the vent valve to the tank than hot-late or sonic welding.