[urq] Fuel vapors smell

[Ingo Rautenberg]

Which reminds me of a way to figure out if the smell is coming from the rear
of the car (IIRC):

Assuming the weather's nice and you have the standard sunroof.  Let's say
you usually don't smell fuel vapors, but when you open the sunroof in tilt
mode, you have a very strong smell of fuel vapors.  That is indicative of
leak at the rear of the car.

During normal operation, air enters the cabin through the vents or windows
(if open) and exits out those two vents over the rear fenders.  When you
have the windows closed, but tilt the sunroof, this creates a vacuum
(highway speed especially), which disrupts the normal airflow through the
cabin, and air is sucked from anywhere due to negative pressure (including
trunk/ fuel tank area) and out the sunroof.

HTH

Ingo

----- Original Message ----- 
From: <Louis-Alain_Richard at computerhorizons.com>
To: "Ben Swann" <benswann at comcast.net>
Cc: <urq at audifans.com>; <urq-bounces at audifans.com>
Sent: Thursday, April 14, 2005 10:58 AM
Subject: Re: [urq] Fuel vapors smell


>
>
>
>
>
> Check this thread:
> http://www.audifans.com/pipermail/urq/2005-January/004510.html
>
> HTH,
>
> LaR
>
>
>
>
>
>
>              "Ben Swann"
>              <benswann at comcast
>              .net>                                                      To
>              Sent by:                  <urq at audifans.com>
>              urq-bounces at audif                                          cc
>              ans.com                   Ben Swann <benswann at comcast.net>
>                                                                    Subject
>                                        [urq] Fuel vapors smell
>              2005-04-14 10:48
>
>
>              Please respond to
>                  Ben Swann
>              <benswann at comcast
>                    .net>
>
>
>
>
>
>
> I have been trying to track down the source of fuel vapors getting into
the
> cabin since I got this car.  I have replace numerous lines, including the
> ones at the tank, but still keep getting fuel vapors in the car.  The
> phenomenon seem to happen mostly upon high boost conditions - that is I
> notice the smell after hard acceleration.
>
> As I have been replacing all my vacuum lines, and checked thoroughly for
> fuel leaks in the hard lines and not detected any leaks.
>
> Before i replaced the rear lines, the smell seemed to be coming from the
> trunk.  Now it seems to eminate from the right front of the car/glovebox
> area, but those hard lines are solid.
>
> Is it possible that this has something to do with the carbon canister?
>
> Also, where is the PCV valve that is supposedly on this car - '83 Ur
> Quattro
> early VIN.
>
> Ben
>
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