coobeast Torque Screwdriver 38Pcs, Gifts for Men Torque Wrench with Inch/Pounds Torque Range 10-70 In-lb, S2 Bits, Sockets and Storage Case for Maintenance, Tools, Bike Repairing and Mounting

It is likely the receptacle you’ve been using has degraded contacts that are overheating. The replacement you ordered is junk. At this time, there are only two 14-50r receptacles that are truly able to handle the continuous charging currents demanded by an EV. They are either the Bryant 9450r, or the Hubbell HBL9450A. They are more expensive, but have contacts that are twice the surface area, which means more grip and better conductivity. Zoro sells the Bryant for under $50. It is also recommended to torque down the terminals using a torque screwdriver to ensure the wires will not work loose and overheat. You can find a suitable one for $35.00: Torque screwdriver kit Of course the best option is to have an electrician install the receptacle, or better yet, a hard wired EVSE to eliminate several contact points that can degrade over time.