Recommended change was 30,000 miles. Don't know anyone who changed it
regularly. Remove bottom hose and check lower screen for rust or at
least make sure none of the carbon is falling out. When the carbon falls
out, it will quickly clog that air inlet tube on the bottom causing all
sorts of fuel delivery problems at high speed or long trips. On 2WD, the
fuel pump suction with a clogged inlet tube will easily collapse the
tank making it look like it was lifted with a jack. Especially the
aftermarket tanks.

Dennis

-----Original Message-----
From: Christopher Gronski [mailto:gronski@gmail.com]
Sent: Wednesday, June 28, 2006 3:05 PM
To: dhaynes@optonline.net
Cc: vanagon@gerry.vanagon.com
Subject: Re: What is the big cylinder in my drivers side rear wheel
well?

How often does it need replacing? Mine has to come off to do the AC job.

Chris

On 6/28/06, dhaynes@optonline.net <dhaynes@optonline.net> wrote:
> Carbon Canister for the fuel tank vapor recovery system. Helps absorb
the fumes will the vehicle is not running. Above idle, a vlave opens to
vent the fuel tank to the air filter. Air is purged through the canister
and the fumes are burned in the engine.  You should hear the distinctive
click of the valve as the throttle is opened.
>
> Dennis
>
>
> ----- Original Message -----
> From: Christopher Gronski <gronski@GMAIL.COM>
> Date: Wednesday, June 28, 2006 1:42 pm
> Subject: What is the big cylinder in my drivers side rear wheel well?
>
> > What is the big cylinder in my drivers side rear wheel well? Its
> > located in front of the AC Reciever Dryer, slightly more towards the
> > rear...
> >
> > Chris
> >
> > 86 Syncro AdventureWesty
> > 87 Syncro PartsVan
> >
>