Gas leaking from this tube,wondering what exactly this tube is

Question

Hello, I'm fairly new to mechanics of motorcycle(riding for 2 years but never tried to repair it myself till last month).

As I noticed I am using way more gas than usual and there was gas odor, then I tried to spot where the leakage was and found out that it was this tube shown in the photo. It's leaking directly on the hot engine. After days long of research about causes of leakages, what I want to learn is;

What this tube supposed to do along with other two tubes connected to the valve?
Could it be something like an overflow of fuel causing overpressure on this tube, resulting in leakage, or is it simply the tube got old?

Will post further pics if necessary, thanks!

Pᴀᴜʟsᴛᴇʀ2 · Answer

From the way it runs, it looks like it's for the reserve (last little bit of gas in the tank).

So,would that mean if the valve isn't on reserve, would this tube still leak?

I'm not completely versant in motorcycles, but yes. I believe the hose has gas at it as long as there is fuel in the tank. I'd suspect you'll need to replace the hose, but you might be able to get away with a small clamp around the end of the hose at the valve. If there's not enough room, you can take a bit of wire (like lacing wire), wrap it around it once, then twisting it to seal the hose to the valve (not too tight, though).

If it's not the hose itself which is leaking, it might be the valve. I think the only way to fix it would be to replace it (obviously depending on how it's leaking, though).

Gas leaking from this tube,wondering what exactly this tube is

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