The confusion in this thread is because the -ve pressure breather is in different places on different models.
The pic that Mudnut has posted is not the tank breather... on a GU anyway.
That pipe is part of the filler neck assy and is there to stop hydraulic locks and blow back when you are filling the tank
It allows air to leave the tank as fuel flows down the filler and doesn't serve any other purpose.
In many of the early GU variants the breather is just beside the Fuel Tank Sender Unit.
It's a small placcy doover about the size of a small inline fuel filter.
They have their own pipe to the tank and are held in place by a small bracket.
There is a good piccy of the location on page FE 24 of the factory manual.
It isn't labelled in the pic or referred to in the Fuel System Chapter.
In other models it is up where Clunk has posted his pic.
I can't be arrsed looking up all the references for later models/variants but they have to have one somewhere as others have mentioned
PS... please don't ask me why the fuel caps have a +ve and -Ve pressure release as well... I don't know.
Perhaps it's a belt and braces thing.
PPS ... as I acknowledged to Mudnut... GQ's may be different, I'm not sure how they are plumbed.
Reply With Quote