Random tube, what's it do?

[gazmus]

Heya, Im a total car noob. Exhausted the limits of my car knowledge today by changing the oil and putting new water in the windscreen washer thing.

I found this tube thats coming off of something and going nowhere

Should it be attached? Its the yellowy one
/
Anyone know?

Car seems to work fine without it being attached btw...as well as expected since I bought it off a nutter and it sounds like a tractor:D

1999, pug 306 with 1.9td engine.

[frank]

its the water drain from the fuel filter, it just hangs down the front of the engine