Fuel tank breathers

[Clunk]

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 (sorry Cobber) .
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

cheers ET, have edited my post accordingly to prevent confusion for owners of other models.

[mudnut]

Thanks, ET. I will have another look tomorrow. Obviously there is a problem with my set up. The breather must be blocked or the pipe crimped somewhere. My Old Trol is an RB30 '94 model if anyone has further info for me.

[the evil twin]

Thanks, ET. I will have another look tomorrow. Obviously there is a problem with my set up. The breather must be blocked or the pipe crimped somewhere. My Old Trol is an RB30 '94 model if anyone has further info for me.

Onya mate... I must admit I am not familiar with the GQ's so I'll nip back and clarify my post.
I've never had to replace one on any of my GQ's but the valve on my GU Uterus was a bit of a PIA when I fitted the Long Ranger tank

[nissannewby]

Onya mate... I must admit I am not familiar with the GQ's so I'll nip back and clarify my post.
I've never had to replace one on any of my GQ's but the valve on my GU Uterus was a bit of a PIA when I fitted the Long Ranger tank

Is that a special edition GU? Does it require routine drain intervals? If it leaks do you just block it with a tightly spun cotton plug?

I believe they are a utility lol.

[the evil twin]

Is that a special edition GU? Does it require routine drain intervals? If it leaks do you just block it with a tightly spun cotton plug?

I believe they are a utility lol.

Nope, not mine...

If I may quote
"The main function of the uterus is to carry, protect and provide nourishment to the developing baby."

That pretty much describes me and mine to a T.

[nissannewby]

Nope, not mine...

If I may quote
"The main function of the uterus is to carry, protect and provide nourishment to the developing baby."

That pretty much describes me and mine to a T.

Thats fine. Either way you look at it a uterus is still part of a females anatomy.

Just to be sure I wasnt intending insult, just one of those little things that annoys me just like when they are referred to as trucks lol

[mudnut]

I had the carpet up and the fuel cover open to check something to do with the fuel pump today, and I traced all of the hoses that come out of the tank.

There seems to be no breather as such, there is a valve in the vapour canister line. The canister has a vacuum control diaphragm and a hose for the fumes to be drawn into the engine.

I have sometimes heard a momentary, weird noise as if air is being drawn past a restriction when the Old Trol is sitting under the carport. I suspect this valve may be not operating as it should as I still have a strong vacuum in the tank.

[Mjcpatrol]

You will find you not allowed to let it breath to atmosphere

[Mjcpatrol]

Back in 1974 they stop that