Apparently there are Austin-Healey Sprite and MG Midget drivers who regularly have to look for cooling on the side because the gasoline is already evaporating in the float chambers of the SU carburetors, or in the supply. It's called in English vapor lock.
Then the motor stops, the hood must be open to provide extra cooling. One of our readers has a solution for this. He has placed a switch in the wiring to the gas pump. The moment he thinks it will go wrong, he switches off the gas pump. With that the float chambers. When the motor almost stops, it switches on the pump again. That then gets cold (er) gasoline supplied and that's it vapor lock problem solved then… In the past four decades we have experienced quite a few kilometers and traffic jams in an MG Midget (and also Austin-Healey Sprite), but never really had such a bad luck. It therefore seems to us that it might be wiser to first find out why vapor lock occurs. Maybe you have forgotten the heat shield between the intake and exhaust manifolds? Is the heat-resistant material still present, is the supply line running too close to the exhaust manifold?
