This is not an inherent problem with this engine, so it should be fixable. The vaporisation will be somewhere on the suction side of the fuel pump, and is most likely due to some sort of restriction in flow(or a slight air leak), such as the screen on the drop pipe in the tank being largely blocked, or the screen in the fuel pump water trap (if the older type of pump), or a kinked or flattened fuel pipe, or the two way tap not being fully in either tank position. These restrictions mean the pressure can be reduced in the line between the restriction and the pump to well below atmospheric, so that the fuel boils at a lower temperature.
I see you have fitted an electric pump. rather than considering a recirculation line, perhaps consider an electric pump right at each tank, but I wonder if you are somehow getting unusually high heat levels, for example by having the fuel line to the left tank too close to the exhaust or ignition too retarded etc.
I have been driving 2.25 Series 2/3 Landrovers for over sixty years, including a lot in NQ and NT as well as inland NSW and Qld, and have never had this issue. Fuel evaporating from the carby when parked hot, yes, but vapor lock, no. Maybe it is a Lightweight thing due to the different bodywok keeping the hot air from the engine more confined.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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