The hose on the right in your first pic is connected to the vacuum port on your petcock (fuel tap). If you have an aftermarket petcock it might not have a vacuum port and might be the reason it is plugged. The port on the left would be connected to your PAIR system which may have been removed and would be the reason it is plugged. Either way I would replace the hoses with proper vacuum plugs.
In your second pic the upper, all black port is just an vent the lower silver with black port is fuel inlet.
Hope this helps.
Fat tires are like thongs. Anybody can wear them, but doesn't mean they look good!