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Date:         Mon, 26 Oct 2009 19:43:34 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Charcoal Cannister Purpose
Comments: To: Michael Sullivan <sandwichhead@GMAIL.COM>
In-Reply-To:  <eccfedcc0910261412g72ffadfbj6b62d331a36d4e38@mail.gmail.co m>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 05:12 PM 10/26/2009, Michael Sullivan wrote: >What is the purpose of this?

It contains "activated" charcoal, meaning it's been treated so as to have an enormous surface area -- an acre per teaspoon or something outrageous like that. Fuel vapor from the tank is vented into the charcoal, which adsorbs (like absorbs, but on its surface instead of throughout) the gasoline vapor.

When the engine is running, it slowly pulls air through the charcoal and into the intake tract, bringing with it the previously adsorbed gasoline which is burned with the rest.

> Any maintenance required? Thanks.

In principle it should last forever -- no moving parts and no chemical reaction btw the charcoal and the fuel. Its connections need to be viable of course.

Yrs, d


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