I know someone will scream at me for sure, but I have a situation and do not have a repair manual available.

Could someone tell me what the single large line coming out of the fuel tank on a 99 cbr600 goes to? I know one of the small ones goes to petcock and assume the other small one is overflow. Is the large one for breathing purposes? I cannot find it hooked to anything nor a place for it to be hooked to anything.

Problem is, fuel POURS from it. Thanks in advance for an answer to a stupid question and an annoying poster.