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Fuel tank breathers
flak monkey - 9/1/09 at 09:59 PM

I currently have a one way tank breather on my fuel tank from when my carbs were fitted.

I presume this will need to be replaced with a 2 way valve as I now have a return to the tank.

Anyone know wheres the cheapest place to get them from? Or alternative suggestions...?

Cheers,
David

David Jenkins - 9/1/09 at 10:02 PM

I bought mine from Think Auto - it's where all the other suppliers buy theirs from! (i.e. the MOCAL brand).

Except Think Auto don't mark up their prices...

mark chandler - 9/1/09 at 11:03 PM

Why?

The return is just pushing back less fuel than is being taken so its still negative pressure.

I just have a one way valve on my breather with no issues.

Regards Mark

twybrow - 10/1/09 at 12:40 AM

I have one of these winging its way to me..... It seemed worth a punt for the price.

BenB - 10/1/09 at 10:54 AM

Yup. But it certainly appears to be a one-way valve...

twybrow - 10/1/09 at 04:29 PM

I have it now, and it would seem to allow a small amount of air back in. I also have one of those from ThinkAuto, and that one seems to let slightly more air back in.

Either way, is everyones tank (including all fittings etc) all 100% leak proof if upside down?

mgmiller - 10/1/09 at 05:35 PM

Hi Twybrow,

What size of hoses fit on the EDS breather valve?

Cheers

Mark

zetec - 11/1/09 at 08:03 AM

Trials bike breather, cheap as chips and no leaks if upside down.

twybrow - 11/1/09 at 11:27 PM

quote:
Originally posted by mgmiller
Hi Twybrow,

What size of hoses fit on the EDS breather valve?

Cheers

Mark


I asked EDS the same, they said,

"It is made for 8mm, but 10mm will still clamp up enough for the use in which these are intended for F2's. I can supply in 6mm also."

Hope this helps...

mgmiller - 12/1/09 at 12:46 PM

Twybrow,

Thanks for the reply - I think I will place an order for 1.

Cheers

Mark

flak monkey - 12/1/09 at 01:01 PM

quote:
Originally posted by zetec
Trials bike breather, cheap as chips and no leaks if upside down.


Thats what I have now, its only one way though. Ill run with it and see what happens.

Thinking about it, I think all that will happen is fuel will not be able to return quickly from the swirl pot (ie air is trying to be pushed out of the breather rather than be sucked in the way its designed to), which shouldnt actually cause any problems because its just fed by a low pressure carb pump with a restrictor in the return line anyway...

David