Thes are fuel expansion/ vapor recovery tanks, located in each front
wheelwell.  Strictly junkyard items only, AFAIK.  The top valve and seal are
both available as replacement parts.  I did some repairs to mine to fix a
broken outlet tube, and it held for years until I sold the van.  It was a
hell of lot better than smelling gas all the time.

Mike B.

----- Original Message -----
From: "Slloth" <slloth@COMCAST.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, March 30, 2008 1:54 PM
Subject: Fuel expansion?

> There is a plastic tank located under the drivers side with about three
> hose coming off of it.  Is this a fuel expansion tank?  Whatever it is
> it needs to be replaced any ideas on what this is and the best place to
> get a new one?  '84 gasoline westfalia
>