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Big Fuel Tanks...
Kevin, et al...
The 'Big Tanks' for the Pressurized Skymasters came along in the 1975 model year. That's when Cessna went to 4-tanks per wing, bringing the total usable to 148 gallons. Standard tanks for the 1973 and 1974 models were 92 gallons usable, with a long-range option totaling 118 gallons and these model years had 3-tanks per wing. Not sure when the fuel was increased to 123 usable, as in your case.
BTW, a later year "G" model of the pressurized series will also provide 148 gallons usable. Type certificate "T337G" is a P337 for those unaware.
Serial number & model years for the P-models break down as follows:
1973 T337G: P3370001 through P3370148
1974 T337G: P3370149 through P3370193
1975 T337G: P3370194 through P3370225
1976 T337G: P3370226 through P3370257
1977 T337G: P3370258 through P3370292
1978 T337H: P3370293 through P3370318
1979 T337H: P3370319 through P3370341
1980 T337H: P3370342 through P3370356
All of the above are Pressurized Models.
SkyKing
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