What's this (probably a stupid question)

[greasykitchen]

Thanks Andrew. There is another hose leading to/from it which has been cut (bottom right hand corner of pic). I don't know what the story is there.

[gtimk5]

Hey Steve,
You have a large and a small hose go to one end and inside the cannister its full of charcoal. This filters the fuel fumes and the L shaped pipe on the other end isnt cut, it has a short piece of hose on it that vents to the atmophere.
Not a silly question mate, its the only way to find out anything.
Andrew

[greasykitchen]

Thanks for the help Andrew. I never knew there was sucha thing! I'll remember to put it back if I take it out when I do the rust.
Cheers.