The rubber hose is probably okay, assuming it was fuel line hose, or the rubber hose that you can buy that is made for auto-transmission fluid lines. Its just made a little thicker and for higher temperatures. There isnt much fluid pressure in the lines, maybe 20 psi at most.
Its normal to have to retighten a srew-type hose clamp after it has been in place. I snug them up at least twice after the initial install; once after a week, a 2nd time about a week or two later.
Of course you could get a new tube and hose assembly, from either a dealer or perhaps from
www.rockauto.com.
I think about half a pint would be the most that would come out, if you opened up that connection. Of course dont run the engine with it open.