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vamram  Samba Member

Joined: March 08, 2012 Posts: 8053 Location: NOVA
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Posted: Wed Sep 11, 2024 9:51 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Lblossom wrote: |
...I am attaching a photo that shows that here is not an expansion chamber but shows the hoses. ...Maybe replace the evap tube? Is it available…I’ll ask at bugcity.com/. This is a 71 super beetle. Any idea what replaced the expansion chamber?
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Ok, looking at your picture I think you *do* have the expansion chamber. It's the beige tube you see part of just to the left of the air box. Unless I'm wrong and you that thing is for something else.
Also, the charcoal canister goes under the passenger side rear fender, not in the trunk. _________________ "Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke
“If something cannot go on forever, it will stop.”
Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
Click to view image
Save the Supers!! |
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Lblossom Samba Member
Joined: March 08, 2024 Posts: 9 Location: Interlaken
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Posted: Fri Sep 13, 2024 6:55 pm Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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I was showing that the expansion tank does not exist and the charcoal canister is gone but I have seen its mounting bracket. The beige thing tricked me too - it is the glove box! |
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EVfun  Samba Member

Joined: April 01, 2012 Posts: 6197 Location: Seattle
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Posted: Fri Sep 13, 2024 10:07 pm Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Lblossom wrote: |
I finally have the official VW manual which explains the emission control. Reading that is fine but this thread has my brain spinning. I am attaching a photo that shows that here is not an expansion chamber but shows the hoses. [snip]
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I'm pretty sure I can see the expansion chamber in that picture. Below is a picture of one from Maddel. It is the white part in the center of the hoses. I think I see yours under the cowl and above the defrost vent tube.
_________________
Wildthings wrote: |
As a general rule, cheap parts are the most expensive parts you can buy. |
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Lblossom Samba Member
Joined: March 08, 2024 Posts: 9 Location: Interlaken
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Posted: Sat Sep 14, 2024 4:59 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Perfect photo! Thanks. The flexible tube coming off the end of the metal line now goes outside along the drivers side fender and is uncapped. I used the capping fitting to put on a short length of plastic tubing on one of the nipples on the driver side of the evap tube. So the evap tube replaced the expansion chamber that used to be mounted to the driver side wall in the trunk? I did not see the second nipple on the evap tube but will check again. Everything else looks like what I have seen so far and the gas smell is gone and I am hoping will stay that way when I add gas. I am below a quarter right now. |
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vamram  Samba Member

Joined: March 08, 2012 Posts: 8053 Location: NOVA
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Posted: Sat Sep 14, 2024 7:15 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Lblossom wrote: |
Perfect photo! Thanks. The flexible tube coming off the end of the metal line now goes outside along the drivers side fender and is uncapped. I used the capping fitting to put on a short length of plastic tubing on one of the nipples on the driver side of the evap tube. So the evap tube replaced the expansion chamber that used to be mounted to the driver side wall in the trunk? I did not see the second nipple on the evap tube but will check again. Everything else looks like what I have seen so far and the gas smell is gone and I am hoping will stay that way when I add gas. I am below a quarter right now. |
On a '71-'72 Super Beetle, the expansion tank/tube goes where it's in your picture and EVFUN points out - directly attached to the cowl, not along the driver's side quarter panel. The "evap tube" IS the Super Beetle's expansion chamber. _________________ "Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke
“If something cannot go on forever, it will stop.”
Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
Click to view image
Save the Supers!! |
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talljordan Samba Member

Joined: January 10, 2012 Posts: 1114 Location: San Francisco, CA
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Posted: Sun Mar 09, 2025 2:11 pm Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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I have a super. And I'm having difficulty figuring out how exactly the expansion chamber mounts to the cowl? I don't see any clips or anything to hold it in place. _________________ 1972 Super Beetle, Parked until adequate restoration funding is acquired in restoration!
Wanted: Male computer diagnostic plug end |
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Lblossom Samba Member
Joined: March 08, 2024 Posts: 9 Location: Interlaken
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Posted: Sun Mar 09, 2025 6:20 pm Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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I did what Sam at JBugs does, I bypassed the chamber running the vent and breather hoses as though it was not there. I put the hose that woudl have gone into and out of the chamber up behind the blower box so that it went uphill then to the driver side fender and then down and out. |
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Marks_Bug Samba Member

Joined: October 23, 2022 Posts: 70 Location: Edmonton, Canada
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Posted: Mon Mar 10, 2025 7:00 pm Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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I find the interest in this topic intriguing. Do a lot of the states still have pollution equipment inspections even for our "antique" vehicles? Isn't it a little ridiculous that they are worried about some minor gas fumes when the engine spews out WAY more pollution than an equivalent modern-day engine?
And if no state laws/inspections why the concern?
When I got my bug two years ago I had to track down a gas smell in the trunk/interior on him. Among other things, I replaced all the lines (liquid and vapour) related to the fuel system. I found the charcoal filter nothing but a rusted out shell hanging in the RR wheel well with no tubes attached. The vapour tube from the tank ended at the wheel well. I removed the expansion tank thinking "KISS"- fewer connections=fewer places for leaks.
The only issue I've had is one time I "topped up" my tank- filling it up into the filler tube and had some gas 'expand' out the vapour tube. Occasionally I get a small whiff of gas vapour but then I occasionally get a whiff of oil, too- all things expected from a 50 year-old car, I think. _________________ I'd be perfect if I wasn't so humble
Current driver: '74 Standard "Sun Bug" Others owned- 1959 Beetle, 1959 Beetle, 1969 Beetle, 1971 Type 3, 1978 Bus |
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kpf Samba Member

Joined: March 01, 2017 Posts: 1061 Location: California, US
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Posted: Tue Mar 11, 2025 8:26 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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@Marks_Bug, indeed there are some situations in the US in which a car as old as 1968 would need all of it's original emissions equipment to be intact and functioning.
In most cases, however, I suspect that people are simply restoring their cars and want to bring them back to original condition. It's a hobby. _________________ 1971 Super Beetle |
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Amsoiltek Samba Member
Joined: May 03, 2022 Posts: 6 Location: California
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Posted: Mon Apr 28, 2025 11:46 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Lblossom wrote: |
I did what Sam at JBugs does, I bypassed the chamber running the vent and breather hoses as though it was not there. I put the hose that woudl have gone into and out of the chamber up behind the blower box so that it went uphill then to the driver side fender and then down and out. |
Do you have a link to that from Sam? |
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vamram  Samba Member

Joined: March 08, 2012 Posts: 8053 Location: NOVA
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Posted: Mon Apr 28, 2025 11:54 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Isn't this thread about keeping/restoring the evap system?? A properly restored system completely eliminates fuel smell even after a fill up. Not to mention performs some minor emissions remediation. _________________ "Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke
“If something cannot go on forever, it will stop.”
Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...languishing since 2022.
Click to view image
Save the Supers!! |
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1500beetle Samba Member
Joined: March 08, 2025 Posts: 8 Location: Switzerland
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Posted: Mon Jul 14, 2025 12:03 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Hi,
i am restoring the EVAP system too. Does anybody know where this screenshot is made from?
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1500beetle Samba Member
Joined: March 08, 2025 Posts: 8 Location: Switzerland
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Posted: Mon Jul 14, 2025 12:04 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Hi,
i am restoring the EVAP system too. Does anybody know where this screenshot is made from?
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baldessariclan Samba Member

Joined: October 14, 2016 Posts: 2078 Location: Wichita, KS
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Posted: Mon Jul 14, 2025 4:54 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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1500beetle wrote: |
Hi, i am restoring the EVAP system too. Does anybody know where this screenshot is made from? |
Scanned images from old parts catalog — ref this site for the whole thing: http://oacdp.org/type1part.html _________________ 1971 Standard Beetle — fairly stock / driver
baldessariclan -- often in error, never in doubt... |
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1500beetle Samba Member
Joined: March 08, 2025 Posts: 8 Location: Switzerland
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Posted: Tue Jul 22, 2025 5:30 am Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through |
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Hi.
Does anyone have an idea which part can replace the retainer for the line at fender, VW part no 113201977?
I think the screws are M8, which is quite big. Does anyone has a better picture of that part?
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