Ferguson TED 20 vaporising oil (which we call petrol here) starts with petrol and then switches to petrol (vaporising oil) when the engine is at temperature. Recognizable by the double petrol tank (petrol / petrol), three way valve on the fuel supply pipe and the aluminum heat shield above the outlet. (To enable the tractor to switch to petrol and then changed to vaporizing oil once hot, it had a dual compartment fuel tank with a three-way fuel tap.) A aluminum heatshield was devised to fit over the manifold and vaporise the fuel.