It was a positive G maneuver most likely and certainly did not have a float carboretor. AFAIK, Spitfires were not outfitted for inverted flight.
Float type carburetor's are not capable of inverted flight as fitted to the Merlin.
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When a carburetor is inverted, it can no longer meter fuel, and the float rises and cuts off the incoming supply.
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http://www.airspacemag.com/how-things-work/upside.html