Place the end of the screwdriver inside of the hose barb on the carbs.I've been doing this for years using a stiff piece of 3mm (1/8") wire. To slide the hose over the barb more easily put some lubricant (fuel will do) on the inside of the hose and use a twisting motion.
that will work with Tygon because it's really stiff. I seriously doubt it will work with the fuel hose the OP has, it's silicone and very flexible. I have it on my bike. SteveYou could be right as I don't know what mine is. It's black, thin, without reinforcing, and reasonably flexible. I don't use any clamps - no leaks.