[s-cars] fuel vapor on warm days

Mark Strangways strangconst at rogers.com
Mon Apr 5 18:28:54 EDT 2004

Gabriel, I will attach the Bently drawing which clearly shows a valve on the
bottom of it.
Look at item 12, by definition it is a valve... below
      9 -  Hose
         To throttle housing
      10 -  Hose
         Hook into clip on activated charcoal filter
      11 -  Sealing ring
         Always replace
      12 -  Ventilation valve
         Regulates ventilation of EVAP canister
         Prevents splash water from reaching EVAP canister

I will agrue this point with you as I am not going out to my car to look.
Too F*** cold, I offer this only as suggestion and what I have read in
To say it's wrong, and dismiss it like that is a bit heavy handed, but suit
Agian all the usual disclaimers apply, YMMV...

Mark S
----- Original Message ----- 
From: "Gabriel Caldwell" <gabriel at ts.bc.ca>
To: "Mark Strangways" <strangconst at rogers.com>; "Wayne Dohnal"
<wd1 at hevanet.com>; "S-car list" <s-car-list at audifans.com>;
<marcweiner at comcast.net>
Sent: Monday, April 05, 2004 2:42 PM
Subject: RE: [s-cars] fuel vapor on warm days

That is incorrect.  Take a look at your carbon canister.  There are TWO
hoses attached to it.  The hose you are referring to, the one that is
open to the atmosphere NEVER emits fuel vapours and it does not have a
valve on it.  The carbon in the canister stores the fuel vapours until
the Carbon Canister Frequency Valve (attached to the OTHER hose) opens
and the engine vacuum draws the vapours in to be burned.  The carbon
canister frequency valve being stuck open would not result in fuel being
released in to the atmosphere however it may cause other problems.  The
carbon canister being damaged in some way could result in a fuel smell.
I would examine the gas cap seal as the most likely culprit.

Gabriel Caldwell

More information about the S-CAR-List mailing list