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Hi rwk,
The vapor canister gathers the gas fumes from the gas tank (there's a hose on the canister that runs from the canister to a steel line on the driver's side frame rail back to the tank).
2 hoses run from the canister to the carb; one directly to the carb, and one to the pvc, and then on to the carb.
The small one you're pointing at runs right to the canister.
Regards,
Alan