make sure its the leaking tube 1st before you try to replace it ofcourse...
If it's actually leaking you should be able to spot the leak.
I had one of the tiny hoses under the intake manifold go and it was an easy fix.
overtime I did develop a bad head gasket leak and had no visual signs of external leakage ofcourse, but It did smell sweet all the time. Oil in my coolant and exhaust is white from the burning coolant.