gas hose
 

I have a 05 CBR 600f4i which I last rode it four days ago and just now seen a puddle of gas under the bike. Got to looking and the hose it is coming from, comes out of the bottom of the tank and hangs straight down. Now, I'm assuming this maybe an overflow hose, or maybe if it builds up pressure, it comes out that hose. Why after four days would it start leaking? I opened the gas cap and now pressure was built up. What would cause this to leak?

there are two hoses that come from the bottom of the tank, make sure one of them isn't pinched or blocked

gas hose
 

Thanks! Neither of the hoses are pinched! Thought maybe build up of pressure, so I opened the gas cap, but no pressure.