As far as I am aware, the early Spitfires (as depicted in CoD) weren't fitted with the modification, so that's why all Battle of Britain era film of Spitfires and Hurricanes shows them rolling onto their backs before diving, to prevent fuel starvation.
It may have been a fuel pump issue rather than carbs, you could be right; to be honest, I'm not that much of an anorak about the RR Merlin engine.
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