Also I think you may be able to splice it with a length of the appropriate diameter of fuel hose. As long as you can get a tight fit from the vacuum line outside diameter and the hose inside diameter you should be fine.
It is a vacuum line. One of the two goes to the power brake booster so without it the brakes would have an extremely firm pedal. I han't traced the other, but I would guess that it provides vacuum for the heater controls and the like. You need them.
