| [ Total Views: 934 | Total Replies: 8 | Thread Id: 101289 ] |
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 Dub_Life
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| posted on March 19th, 2013 at 07:14 PM |
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Fuel tank venting
The car is a 1972 super beetle (ej20 conversion incase it matters), and the fuel tank venting system has been removed I was wondering if someone could
explain how it should be installed, and if its all necessary for road worthy inspection etc? Are there any alternatives to use instead? Thanks in
advance for your help.
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waveman1500
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| posted on March 19th, 2013 at 09:17 PM |
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This chamber goes up under the cowl panel, right behind the rear edge of the bonnet opening. All the hoses go to the fuel tank, except for one which
will vent somewhere, either to a charcoal canister or to atmosphere. I believe the idea is that fuel vapour can condense in this chamber and drain
back to the tank. My S-Bug didn't come with this chamber, so I had to replicate it by looping breather hoses up high behind the dash. Basically, as
long as you have a breather hose looping up high and then venting somewhere outside the car (in a fender well or under the spare wheel well), you will
be pretty right.
In South Australia, you shouldn't need a roadworthy inspection, unless it is part of getting your engine conversion properly engineered. If so, ask
the engineer what his requirements are. He would probably suggest to get rid of all this old-school system and use a single charcoal canister as per
the Subaru setup.
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psimitar
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| posted on March 20th, 2013 at 01:32 AM |
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Yes that's a condenser for under the windscreen scuttle panel. The top righthand outlet is meant to go via pipework to a charcoal cannister mounted
under the rear passenger wing. Even if you do vent it to air then it should vent past the rear qtr panel/wing join so the fumes aren't drawn back
into the vehicle cabin 
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1303Steve
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| posted on March 20th, 2013 at 08:37 AM |
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Hi
Beetles didn't have carbon cannisters fitted until 1975. All you really need for a stock 72 Beetle is a bit height in the breather hose so that
expanding fuel doesn't spill out, the venting system you have a photo of was dumped on later supers.
My old 72 super just had a piece tube that ran across the scuttle and vented to atmosphere.
When my 1973 Subaru powered bug was checked by the engineer and the RMS it had to have a functioning carbon cannister and other pollution gear
associated with the a 2003 model motor, two cats etc
But as suggested talk to your engineer about what is needed.
Steve
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ian.mezz
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| posted on March 20th, 2013 at 09:44 AM |
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yep what ever your car had stock, Fuel tank venting
is a part of the car. nOT motor
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Joel
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| posted on March 20th, 2013 at 12:17 PM |
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Australia was pretty laid back with emissions laws back then.
It's hard to find any sort of diagram as our cars differed from overseas.
When they first released the Superbugs here in 71 they had the overseas tank breathers but no charcoal canister but that was dropped pretty quick.
If your tank has the 2 port on the top left corner and one below the fuel filler neck it would have had one originally.
I wouldnt worry though, mine is 74 and passed engineering for a EJ25 without one.
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Dub_Life
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| posted on March 20th, 2013 at 02:28 PM |
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Thanks everyone! I think for now then I'll connect it up with a loop and if the engineer or inspection pick it up I'll change it then.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on March 20th, 2013 at 04:00 PM |
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depends where the petrol smell goes in hot weather..lol
Mine hose ends up next to the spare wheel on the LHS
a metal pipe goes thru the hole..
the hose goes up above the dash across and down to the pipe..
I just hate thinking that there are very inflammable petrol fumes there. lol
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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1303Steve
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| posted on March 20th, 2013 at 04:31 PM |
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Hi
I don't know what VW were thinking when they put all those breathers in the tank to hook up to that big plastic thing.
They came to their sense later on and deleted almost all of the small breather connections.
I just used factory tee section and then ran tube up in a loop and then ran a hard plastic tube to a carbon canister mounted under my right rear
mudguard.
Steve
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