Avoneer
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| posted on 10/12/05 at 11:53 AM |
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Fuel Tank Breather
What have people used for a fuel tank breather and where can I buy one?
Cheers,
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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liam.mccaffrey
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| posted on 10/12/05 at 12:02 PM |
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cant you use a tyre valve?
[whisper]did you manage to order the DD2's[/whisper]
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Avoneer
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| posted on 10/12/05 at 12:24 PM |
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I heard that - but surely it has to let air in and out as you fill and use the fuel in the tank?
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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mookaloid
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| posted on 10/12/05 at 12:25 PM |
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I just used a bit of rubber tube, got it as high up as possible then down out of the bottom of the car.
No problems encountered so far
Cheers
Mark
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liam.mccaffrey
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| posted on 10/12/05 at 01:03 PM |
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don't you use 2 one to leak in and one to leak out
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piddy
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| posted on 10/12/05 at 01:24 PM |
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I've been told you don't need a breather on the tank, if you fit a cap that can breath.
I'm interested if this is true.
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Avoneer
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| posted on 10/12/05 at 01:26 PM |
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Yep, that's true - but the ali aero cappy things are non breathers.
Two bike/car valves - that's two hole in the tank isn't it?
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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paulf
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| posted on 10/12/05 at 01:32 PM |
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I used a vented cap, but surely a bit of hose with a restrictor in it such as a .6mm mig nozzle, would allow air in and out but not allow fuel to leak
to rapidly in the event of an accident , or two bike valves connected to a tee piece as used in windscreen washers .
Paul.
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lsdweb
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| posted on 10/12/05 at 01:41 PM |
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Surely one car (Schreider?) valve to let air in would be OK - that's what's on my car now. You wouldn't need one to let air out as
you're filling the tank as you'd have the cap off?!
Wyn
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emsfactory
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| posted on 10/12/05 at 01:48 PM |
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I drilled a tiny hole in the back of the filler cap pipe.
only 1mm.
No probs.
If its getting laid up for a while just put some tape over it to seal it.
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MikeR
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| posted on 10/12/05 at 02:24 PM |
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Mate does fuel systems for a living.
when i talk about what we do his reaction is funny. It can basically be summed up as ......
Wave arms over head, look scared, repeat, "you're all going to die".
Now i realise he's being melodramatic but, he has to jump through hoops for a reason. How would you like to be upside down in a ditch with fuel
pissing out of your tank onto you?
If you're about to say whats the chance of that i know of a number of people who've been in cars that have rolled!
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bob
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| posted on 10/12/05 at 02:42 PM |
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I had a think about what i could make or make do with,in the end i thought best to be on the safe side and bought a one way breather valve from
thinkauto.
http://www.thinkauto.com
http://www.locostbuilders.co.uk/photos.php?action=showphoto&photo=right_in_the_boot.jpg
[Edited on 10/12/05 by bob]
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Avoneer
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| posted on 10/12/05 at 04:32 PM |
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This is nothing to do with the car rolling over - that is something else.
This is to with not creating a vacuum in the tank so it doesn't collapse.
So basically, from the tube from the tank, I could fit a car valve upside down in the end of the tube? This would suck air in when the fuel goes down
would it not?
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Mix
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| posted on 10/12/05 at 04:38 PM |
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Don't forget the other function of the breather, to allow pressure build up due to expansion to be released.
Mick
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Avoneer
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| posted on 10/12/05 at 04:47 PM |
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Bob - what size pipe does it push on and has yours got a pipe coming off the side of it?
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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MkIndy7
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| posted on 10/12/05 at 05:06 PM |
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Maybe remotely relevent but not sure...
My dads Hyundai seems to work with a vaccume in the tank, when you fill it up after a drive you can actually hear it suck quite alot of air in as you
unscrew the cap.
Maybe they can do this with injection, or it has another way of allowing air in if and when it needs it. (I suppose if you pressurise the tank it
might act as a buffer to lessen how often the pump runs)
Might be worth looking at how manufactures prevent vaccumes in their systems, either at the scrapyard or in the Haynes.
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bob
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| posted on 10/12/05 at 05:21 PM |
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Pat
Mine is a regular piece of fuel pipe (8mm i think)
I just drilled and tapped a 1/4bsp brass fitting into the tank then fitted the small piece of fuel pipe and then the valve.
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MikeR
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| posted on 10/12/05 at 05:51 PM |
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quote:
Originally posted by Avoneer
This is nothing to do with the car rolling over - that is something else.
This is to with not creating a vacuum in the tank so it doesn't collapse.
Pat...
No Pat, this is everything to do with being in an accident. You need a vent in your tank to stop the vacum. What i'm saying is make sure your
vent is safe. Think not just for stopping the vacum but when you're in an accident. Those with lines that run up to the roll bar and back down
are not safe! What i'm doing is fitting a vent from stoneleigh. Its not perfect as its going to be attached via a small rubber tube which should
(hopefully) be fireproof.
I find it strange but the rules on building road cars are now more strict than race cars in many areas. This is one of them.
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Avoneer
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| posted on 10/12/05 at 08:52 PM |
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Sorry mate, thought you were just on about the ones that are for roll over protection only.
Guess I'll order a posh "think" one - can't go wrong then.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Kowalski
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| posted on 10/12/05 at 11:45 PM |
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The breather that some cars have has no valve in it. It consists of a length of hose that goes from the top of the tank (where it connects to the
tank) down to the bottom of the tank and under it then back up to the top where it's open, sort of in a big 'U'. It has to be
designed so that no matter which way up the tank and breather are, the fuel can't run out of the breather.
[Edited on 10/12/05 by Kowalski]
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MikeR
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| posted on 11/12/05 at 01:26 AM |
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again this is where my mate chimes in ....... and what are you using to create this big u? Rubber? Pah, lasts about 3 seconds in a fire....... then
fuel will wee all over you.
(he's given me this lecture more than once)
p.s. sorry i was a little condensending in my last post - was rushing to get out.
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907
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| posted on 11/12/05 at 06:42 AM |
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I have a pipe that runs from the top of the fuel tank to the air filters.
Any good?
Production cars seem to vent all sorts into the airbox.
Paul G
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Viper
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| posted on 11/12/05 at 09:45 AM |
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quote:
Originally posted by MikeR
again this is where my mate chimes in ....... and what are you using to create this big u? Rubber? Pah, lasts about 3 seconds in a fire....... then
fuel will wee all over you.
(he's given me this lecture more than once)
p.s. sorry i was a little condensending in my last post - was rushing to get out.
So how quickly would the plasic fuel pipe running the full length of millions of cars take to burn through?
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MikeR
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| posted on 11/12/05 at 12:21 PM |
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most cars now use plastic covered aliuminium with reinforced, plastic fireproof overbraid flexi connectors.
I've got 5 lines from the BMW mini in my garage - ex display and heading for the skip!
(edited to add, my mates company does plastic covered Ali, no idea what other suppliers use. Was going to mention companies he works with but
don't want to get him in trouble in case i accidentally give away trade secrets)
[Edited on 11/12/05 by MikeR]
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ady8077
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| posted on 11/12/05 at 01:46 PM |
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Hi
I used a one way breather valve from https://www.harris-performance.com/website/frameset2.htm
Adrian
 
Rescued attachment breather
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