[s-cars] Gas smell when hard on throttle

[Steve Powers]

if it's the dreaded charcoal cannister, it performs the task of
recycling overflow (due to expansion) back to the gas tank. there's
generally a solenoid switch in the vacuum line (for non-turbo apps)
that enables/disables flow through it; not sure how it would work for
a turbo car.

all of the motorcycle forums I'm on talk about how to remove them and
reroute the tubing. google on "cannisterectomy". you might be able to
get a take off if you still want that functionality.

Steve Powers

On 10/18/06, mike schowengerdt <urdrquattro at yahoo.com> wrote:
> fuel tank is vented to charcaoal cannister, cannister is then vented to engine under certain conditions,IIRC, not @idle, @part throttle cruise , @full throttle- not sure?  with turbo pressure there is probably a one-way check valve incorporated somewhere tro prevent back flow
>
>
> ----- Original Message ----
> From: Igor Kessel <KBATPO at comcast.net>
> To: Tom Green <trgreen at comcast.net>
> Cc: s-car-list at audifans.com
> Sent: Wednesday, October 18, 2006 1:57:07 PM
> Subject: Re: [s-cars] Gas smell when hard on throttle
>
>
> Tom Green wrote:
> > Dealer or worldimpex.com or similar online source that deals in some
> > genuine audi parts as well as OEM
> > replacements.  It's one of the check valves (bleeder valves) that
> > control fumes to the charcoal canister.
> > The parts in this system are typically outrageous in price
> > considering the minimal impact on emissions this
> > little system can have.
> >
> > It would take some fuel resistant epoxy or the like to repair the
> > valve, and if it doesn't operate you may still
> > have the fumes.  I assume the missing air-box was removed to access
> > the area and future work here will
> > require removing it again each time.  You should consider any fuel
> > fumes you can smell as being concentrated
> > enough to be dangerous, since you generally don't have any other
> > information to evaluate.
> >
> > Tom
> >
> >
> >>> On 10/17/06, Alvin Labonite <alabonite at gmail.com> wrote:
> >> It looks like I found the source of the smell. Any idea what this
> >> is and
> >> where to get this part?
> >>
> >> http://forums.audiworld.com/s4s6/msgs/139763.phtml
> >>> it's definitely noticeable/smellable :) inside the cabin when hard
> >>> on the
> >>> pedal which I noticed at lunch time today. I popped the hood open
> >>> and it
> >>> seemed to be coming from the passenger side between the headlight
> >>> and the
> >>> air-box. I can see a fuel line behind the air-box that goes
> >>> underneath but not
> >>> sure where its going to. I will investigate when I get home
> >>> tonight. Any
> >>> ideas before then?
> >
> >
> > _______________________________________________
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> >
>
> Gentlemen,
> can anybody educate me on how the whole thing works? My take on this is
> as follows:
> The Bleeder Valve vents the fumes to the Charcoal Canister. The charcoal
> in the canister absorbs the fumes. Is its capacity infinite? Does it
> ever get saturated? Cuz if not, then gluing the Bleeder Valve back
> together would seems to be the most cost effective way of dealing with
> this issue.
>
> --
> Igor Kessel
> two turbo quattros
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