TrophyJem
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| posted on 22/3/12 at 01:05 PM |
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Fuel tank breather?
Not strictly an EFI question as I'm running carbs, but it seemed the most logical section to ask my question.
Currently my fuel tank breather is just a piece of pipe from the top of the tank that runs as high up as possible and then down below the tank in a
"n" shape. The pipe is open, so when the car is parked in the garage it smells of fuel a bit. So when its parked up I just bung up the
hole.
I'm thinking there must be a more elegant solution by way of a valve or something, but I can't seem to find anything.
Any suggestions?
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rodgling
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| posted on 22/3/12 at 01:25 PM |
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I think the normal approach is to put a complete loop in it - I've done this and have no problems with fuel vapours.
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Slimy38
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| posted on 22/3/12 at 01:33 PM |
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Doesn't the breather on production cars connect back into the filler pipe just below the cap? Can the same be done here?
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ernie
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| posted on 22/3/12 at 01:36 PM |
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Burton A1 PC30 non return valve
PANDE FIRE & SECURITY SYSTEMS
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mark chandler
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| posted on 22/3/12 at 02:29 PM |
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Servo valve from breakers, much cheapness
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coyoteboy
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| posted on 22/3/12 at 02:43 PM |
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Yeah either a solenoid valve rated for fuel vapours (probably most to be fair) or justuse a one-way valve. One way valves have the lovely additional
safety of if the car flips it won't dribble on you and ignite (however likely that may be).
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thefreak
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| posted on 22/3/12 at 02:43 PM |
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Something like this?
http://www.jjcraceandrally.com/race/fuel-unions-fittings/mocal-in-tank-breather-valve
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TrophyJem
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| posted on 22/3/12 at 02:54 PM |
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quote:
Originally posted by thefreak
Something like this?
http://www.jjcraceandrally.com/race/fuel-unions-fittings/mocal-in-tank-breather-valve
That looks like the sort of device I've been searching for.
Cheers
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renetom
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| posted on 22/3/12 at 05:53 PM |
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tank breather
Hi
This is our layout (see my archive) for pict.
One way valve & a small filter, no smells & safe if you roll it.
Good luck
René
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TrophyJem
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| posted on 22/3/12 at 06:18 PM |
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quote:
Originally posted by renetom
Hi
This is our layout (see my archive) for pict.
One way valve & a small filter, no smells & safe if you roll it.
Good luck
René
Thanks. That looks a neat solution.
So do I not need to worry about expansion in the tank (like if the car is standing on a hot day)?
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renetom
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| posted on 22/3/12 at 06:36 PM |
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tank breather
Hi
our layout is an air admittance so that when the tank runs down it let air in .
any expansion should vent out of the filler cap if it ever got that far ( doubtful )
René
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bigfoot4616
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| posted on 22/3/12 at 08:08 PM |
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mine has one of these, lets pressure out as well as air in.
http://www.newton-equipment.com/inline_valves.html
or maybe not at this price
http://www.demon-tweeks.co.uk/Product.do?method=view&n=1546&p=141976&c=215&utm_source=Google&utm_medium=Base&utm_campaign=Fuel
%20Tank%20Vent%20Valves
it was on the car when i got it
[Edited on 22/3/12 by bigfoot4616]
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TrophyJem
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| posted on 23/3/12 at 08:44 AM |
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quote:
Originally posted by renetom
Hi
our layout is an air admittance so that when the tank runs down it let air in .
any expansion should vent out of the filler cap if it ever got that far ( doubtful )
René
This sounds like a plan to me as the air admittance valves are fairly cheap.
Cheers
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TrophyJem
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| posted on 23/3/12 at 08:45 AM |
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quote:
Originally posted by bigfoot4616
mine has one of these, lets pressure out as well as air in.
http://www.newton-equipment.com/inline_valves.html
or maybe not at this price
http://www.demon-tweeks.co.uk/Product.do?method=view&n=1546&p=141976&c=215&utm_source=Google&utm_medium=Base&utm_campaign=Fuel
%20Tank%20Vent%20Valves
it was on the car when i got it
[Edited on 22/3/12 by bigfoot4616]
Nice valve, but ouch on the price!
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renetom
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| posted on 23/3/12 at 09:13 AM |
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tank breather
Yep
About £3 each, 8mm valve & filter, both on ebay.
René
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