Complete Fuel Tank Venting / EVAP System Walk-through

[1500beetle]

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?

[baldessariclan]

[1500beetle]

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

[1500beetle]

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

[vamram]

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!!

[Amsoiltek]

[kpf]

@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

[Marks_Bug]

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

[Lblossom]

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.

[talljordan]

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

[vamram]

[Lblossom]

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.

[EVfun]

[Lblossom]

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!

[vamram]

[Lblossom]

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. The carbon canister is gone leaving only the bracket. After replacing the plastic hose from the evap tube which had become hard and broke at the point where it attached to the small metal tube, and leaving it open to vent ( I think i understand why it was attached to a metal fitting that was closed at the end which with the original set up made sense) I still have some gas odor. I suppose I should look for another open hose or tube somewhere? 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? Thanks. There really are not people in my area who work on these cars although one person with very limited time helps with the engine. Upstate NY beetles have rusted and were gone decades ago.

[DUNGBTL]

I made my own vapor trap…

[2002EVC]

Finally diagnosed that my expansion chamber / fuel trap was plugged after getting pressure from the cap as well as leaking at the filler connection. Instead of finding a replacement '71 SB expansion trap, I connected two separate 5MM lines as shown as 5 so that any expansion fuel drains back into the tank and 4 attaches to 6 to the right corner of the car. On a hot day I get some condensation to the right rear, but it seems to be working with no fuel smell.

The original expansion trap is not cracked, just seems clogged. Any ideas on repairing or if that's even possible? When I blew air into it, it was clearly restricted, but I figured I'd ask here about how to clean that or if it's even possible.

[tissyfit]

I will be utilizing this page in the near future amazing tutorial.
_________________
New at this vw stuff. Any knowledge is helpful knowledge is power!

[Lost69Convertible]

A non-automotive name for the expansion tank is GLS: Gas Liquid Separator
(Here “Gas” is a gaseous state. Not gasoline)

On the drivers side, I think Line 4 is for gaseous and liquid phases of gasoline to expand (or burp) into the GLS. And I think Line 5 is for liquid to drain back to the tank - but this line probably burps into the GLS at times.

On the passengers side, I find it hard to tell what the real intention is. But I agree there must be a drain back to the tank on the passenger side. The car and GLS can roll to both sides - so a liquid drain on both sides is needed.
_________________
1956 Beetle Ragtop: My Father's car
1969 Beetle Convertible: My first car. I loved it, I lost it, and I never got over it.
1979 Super Beetle Convertible