On 12/6/04 2:06 PM, "Michael Rule" <manikmike@YAHOO.COM> wrote:

> Hi All,
> 
> Can someone please explain the purpose of the fuel expansion tanks?
> Well, besides apparently sending debris back into the main gas tank
> when those top seals fail...
> 
> Guessing there's some vapor trapping/recycling involved, and wondering
> if some clogging/malfuntion of these that causes that splashy gas burp
> if I fill the tank too quickly...
> 
> And maybe also why I've never seen another vehicle with them?
> 
> Not that I'm particularly well-travelled mind you, but if I can hammer
> out these last few issues in my Westy, I might be...
> 
> Thanks,
> Mike
> 84's
I have seen them on other vehicles that have a similar designed fuel tank as
the vanagon.  The reason is that the vanagon has two high points that need
to be vented to the vapor trapping expansion jugs.  There the vapor will
condense back to liquid and flow back down the tank through one of the two
lines at the bottom.  The top valve I believe feeds the charcoal cannister.
There is also two vent lines that come from the hump areas that go to the
tank filler vent tube.

Check this pic

http://tactical-bus.info/VanagonFuel/fueltanksysPic.jpg

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jimt
Planned insanity is best.
Remember that sanity is optional.
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