Lots of disagreement on this one. Some say to plug the hose with a BB. I've never heard to just take it off. In my case my '79 115 runs just fine set up like the factory did it with the hoses in place and not plugged. Over the last 30+ years its had three carb rebuilds a couple of fuel pumps and lots of water pumps. Even replaced those little hoses because they were brittle. But, still runs like new.