Hmm, Three Knobs!

[ORB 227 1 Cars]

I know what two are for, but what is the little White one all about?

 

[Henry Yorke 269 3 Cars]

This is from a late catted car (122bhp / 1.9 CTI / Gentry) with a carbon cannister in the passengers wheel arch. It is where the fuel vapours are released into the inlet and burnt off. Emissions innit?!

[ORB 227 1 Cars]

Ohhhh, all sounds a bit gay to me!

 

Now, where are my blanking grommets....