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The Mercedes blower was intended to be used for only brief periods. It was indeed engaged by fully depressing the accelerator pedal, which also engaged the drive clutch for the blower.
Mercedes compressed the whole shebang, carburettor and all, with the float bowl included within the pressurised part of the system so that the mixture wouldn't be affected.
Under the pressure, Caracciola had to use the blower for too many long stints, hence the engine failed.
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