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Mark is correct. It was an option in 1968, my vintage, and the POH describes it as Mark has explained. I have a spot labeled on my rocker panel for the switch but my craft did not have the option. I have never heard anyone talk about using this option or if it was available on other Cessna models. I assume the fuel is eventually vaporized in the crankcase?
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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