macspeedy
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| posted on 5/4/04 at 09:10 AM |
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breather pipe
on the tank i have bought there is a breather pipe near the sender would a length of fuel pipe on this be adequate?
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Peteff
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| posted on 5/4/04 at 09:30 AM |
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Is it a breather or a return pipe? I made my tank and used a mini filler neck which uses a vented cap. I put a return into the filler neck and when
the engine is running a lot of petrol goes back to the tank through it. This is on a 2.0 pinto with the standard mechanical fuel pump.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Mk-Ninja
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| posted on 5/4/04 at 03:07 PM |
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If its a breather it should have a non return valve in it. Jon Ison came up with a good tip a couple of weeks ago. ie to use a tyre valve. I had to
reduce the spring rate on the one I used but works well.
Still have the pipe loop and finish pointing down but just put the valve in the end.
HTH Gordon
I'm sure I've got one, just don't know where I've put it
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Northy
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| posted on 5/4/04 at 06:16 PM |
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Gordan,
I've fitted a tyre valve also 
But I haven't redused the spring rate, how do you do that?
Also, did you fit yours so air could go into the tank, or out of it?
Cheers
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Mark Allanson
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| posted on 5/4/04 at 07:18 PM |
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I am going to use two tyre valves attached to a 'Y' connector, the valves only open at about 2 psi, so one will open if there is 2psi
pressure, and the other will open if there is 2psi vacuum. Attached to a fuel marked pipe, well above the tank, I think there should be no SVA
problems..........unless anyone knows different?
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Mk-Ninja
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| posted on 5/4/04 at 10:07 PM |
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Mine just allows air into the tank so will stop anything trying to get out, but Marks idea sounds good.
Note the valves must point down, somebody failed on that point recently.
I'm sure I've got one, just don't know where I've put it
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Mark Allanson
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| posted on 5/4/04 at 10:11 PM |
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Why have they got to point down?, I thought as long as they are well above the top of the tank they should be OK
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Mark H
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| posted on 6/4/04 at 03:59 PM |
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Dangerously enough,
mine passed SVA last year with only an open petrol tube about 6 inches long from the top of my ally tank.
Realsied how bad the petrol swirl was when a bike flashed me and said i had a leak!!
In theory if i braked hard now, petrol would shoot over my helmet and shoulders with the aim of my pipe - not good, and will redesign v. soon.
Mark Harrison and
Q986 KCP back from the dead...
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Hellfire
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| posted on 7/4/04 at 11:42 AM |
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Is it ACTUALLY an SVA requirement. I was looking in the manual last night and couldn't find any mention of it. (It isn't the most
up-to-date version) Common sense tells you it should be vented but surely a length of hose with a return on it is sufficient.
If it does have a valve and only allows air in, what happens if its stood outside on a hot sunny day building up pressure in the fuel tank 
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Northy
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| posted on 7/4/04 at 06:07 PM |
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I phone Beverly SVA test centre and they told me they didn't care what I did with it!
Seems stupid when they are bothered about seamingly trivial stuff.
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Hellfire
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| posted on 8/4/04 at 07:23 AM |
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Thats good enough for me
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ady8077
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| posted on 13/4/04 at 03:52 PM |
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Hi All
Just thought i'd post about an inline breather i've bought from http://www.harris-performance.com/
only £10 and has a ball in it to stop leaks if you roll, safer than an open pipe
Adrian
 
Rescued attachment breather.jpg
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