My understanding of the function of the charcoal filter is... When gas is
heated it expands, and in order not to let the toxic gases into the air, the
charcoal filter captures and treats the escaping gas.  Likewise, when the
gas tank is cooled it allows clean, dust free air into the tank... thus
regulating the pressure inside.

Jack

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Kevin Plichta
Sent: Friday, September 12, 2008 10:23 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Gas tank sucked together!

So what dose the charcoal filter do? Dose it let air in the fuel system? I
know where the charcoal filter is but not sure how the fuel flows, or the
path of the fuel.
Thanks
Kevin> Date: Thu, 11 Sep 2008 19:53:38 -0400> From:
plichtakevin@HOTMAIL.COM> Subject: Gas tank sucked together!> To:
vanagon@GERRY.VANAGON.COM> > My 91 is having a problem with the gas tank
being sucked together. I have noticed that when I open my gas cap that it is
very hard to pull it up and air is being sucked in, a very tight vacuum. I
am not sure where or now air get into the tank after gas is used? From
expansion tanks? Carbon filter what its roles is? I would like to figure out
where air should be going into the tank to see what's plugging it.> Thanks
again for the wisdom!> Kevin Plichta > >
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