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Complete Fuel Tank Venting / EVAP System Walk-through
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vamram Premium Member
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PostPosted: Wed Sep 11, 2024 9:51 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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?
Image may have been reduced in size. Click image to view fullscreen.


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.
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Lblossom
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PostPosted: Fri Sep 13, 2024 6:55 pm    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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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PostPosted: Fri Sep 13, 2024 10:07 pm    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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]
Image may have been reduced in size. Click image to view fullscreen.

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.
Image may have been reduced in size. Click image to view fullscreen.

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PostPosted: Sat Sep 14, 2024 4:59 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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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PostPosted: Sat Sep 14, 2024 7:15 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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.
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PostPosted: Sun Mar 09, 2025 2:11 pm    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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.
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PostPosted: Sun Mar 09, 2025 6:20 pm    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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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PostPosted: Mon Mar 10, 2025 7:00 pm    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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.
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PostPosted: Tue Mar 11, 2025 8:26 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

@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.
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PostPosted: Mon Apr 28, 2025 11:46 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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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PostPosted: Mon Apr 28, 2025 11:54 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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.
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“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
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PostPosted: Mon Jul 14, 2025 12:03 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

Hi,
i am restoring the EVAP system too. Does anybody know where this screenshot is made from?

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PostPosted: Mon Jul 14, 2025 12:04 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

Hi,
i am restoring the EVAP system too. Does anybody know where this screenshot is made from?



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PostPosted: Mon Jul 14, 2025 4:54 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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
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PostPosted: Tue Jul 22, 2025 5:30 am    Post subject: Re: Complete Fuel Tank Venting / EVAP System Walk-through Reply with quote

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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