Quote Originally Posted by Throbbinhood View Post
To be honest, if I remember correctly my breather line (the right angle one) was blocked off. I plumbed everything else up as per the LRA diagrams and it all works perfectly, even on hot days. So far has not been an issue and touch wood it doesn't become one in future.
Or did you mean the "charcoal canister line"(as it's connected in mine) from the top of the expansion tank?
If that's the case, that means "slow breathing/venting" isn't happening in your tank, and fumes just stay inside the tank.
But, having two tanks still minimizes your chances of any pressure build up accidents. Besides, some pressurized fumes might escape from weak points like fuel cap.
I've been wondering whether the fuel cap is designed to allow that to happen, 'cos if you look at the pictures of the fuel cap above, it doesn't look like a simple fuel cap, but some mechanism appears to be there at the bottom of it.