Hi Randy,
"Someone" told you WRONG!. The small tank is not a "reserve" tank, it is the STARTING tank. It is supposed to contain a gallon or two of gasoline for starting the tractor. Once the engine and manifold are HOT, you would switch to the main tank which would be full of distillate or tractor fuel. This was similar to kerosene - not very volatile, but CHEAPER than gasoline. The cap on the small gasoline tank should be RED. The cap on the main tank should be GREEN.
This illustration above represents the fuel tanks on the Model B's from serial number 96000 to serial number 200999.
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