With the C model and others (but apparently it is not for the G model) there is an AD that the cooling duct had a connection to cool the fuel gauges. I don't see this for the G model (see link below for C model)
http://rgl.faa.gov/Regulatory_and_Gu...4?OpenDocument
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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