I'm afraid it failed due to old age. You are going to have to replace it every 20 or 25 years from now on.

The original hose has a woven covering that acts like a chinese finger trap and needs no clamp. You could substitute neoprene fuel line or clear plastic. The clear line doesn't need a clamp as a rule, but if you want to put one on, small plastic tie wraps work well for mini hose clamps.

While you are under the hood, check all your fuel lines, radiator hoses, heater hoses etc. If they are mummified and hard, or soft mushy and swollen it would be a good idea to replace them now before you get stranded on the road. Like I say, this is normal maintenance and will need to be done every 20 or 25 years.