1 tube is a fuel line and 1 tube is a vacuum line
The big one is the gas line which goes to the petcock.
The smaller one is a vacuum line which also goes to the petcock.
That is a vacuum operated petcock, which works off the vacumm off the intake side of the carb.
the intake side is the engine side, the other side of the carb is airbox side.
There should be a nipple sticking out of the carb on top on the intake side.
If not then the nipple is on the intake boot itself, on top.
The intake boots are on the engine side of the carb and the airbox boots are the opposite side.
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