It is always repairable but sometimes easier to replace completely. A Quick repair will get you going but the Fuel line that goes down on to the Fuel lines Fitting itself will have a protective rubber insert to keep the Fuel line fitting from cutting from the inside.
So when you remove the line to REPAIR it make sure to watch the pieces cause the Very small rubber pieces can get into the fuel lineshould you repair it just flush it out into a bucket first before you hook it up. Use a Good small Fuel line Clamp not a Cheepy value pack like Walmart ETC!!, or it can strip out from the Vibration of these bikes, or work it's way loose spraying fuel all over the rear of the tire causing loss of control.
Look at the Quality when it comes to fuel related parts. Always buy Two clamps Besafe on this repair and post up if need be.Take your time.*Jimi