Mike---The evaporative line that goes from the gas tank to the carbon
canister should not be blocked off. It is a tank vent.
You can make the ID of this line smaller, if you choose, by inserting a
smaller tube inside, at the open end. If this is the source of what you
are smelling, this should reduce it to practically nothing, yet the tank
can slill breath.
With a little work, it can be rigged to terminate in the air filter
housing, so fumes can be consumed by the running engine.
Ideally, it should be hooked up to the carbon canister. As designed, it
will not reduce the engine's performance.
Dick
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