I noticed that the charcoal canister I removed from a '94 Jetta and
the one on my 1981 Vanagon were similar. (I swapped a Jetta engine
into my '81 Vanagon)

Can you blow air through the canister? My Bentley manual isn't handy
right now but I believe the bottom port is a vent. Regardless, I'm
pretty sure one should be able to blow air through the top inlet and
outlet.

With the canister purge valve disconnected, I'm about certain you
shouldn't be able to suck air through it. If it were me, I'd connect
it to the engine only, run engine, raise idle, then feel and listen if
air is being drawn through the valve.

van-cafe has the valve it seems:

http://www.van-cafe.com/home/van/smartlist_734/fuel-evaporative-parts-c734

maybe Busdepot.com has the charcoal canister?

On 6/3/14, Richard Duvernay <richard.duvernay@sbcglobal.net> wrote:
> Hello Listserve Members:
>
> I have a 90 Westy and I'm looking for a charcoal canister and associated
> purge valve that lives inside the passenger side rear wheel well. Something
> is clogged or not working in my van at this point in the EVAP system.  When
> it's hooked up (at the canister) the fuel system is not venting and pressure
> builds up in the fuel tank which causes flexing of the tank (big bonking
> noise) and when the gas tank cap is removed...big whoosh.  When I
> disconnect, all is well, and I lose my fear of blowing up.
>
> I can't seem to find this part for sale anywhere as a new aftermarket and I
> had no luck on Samba Classifieds.  Does anyone have one they will sell me
> for a fair price and shipping?  Thanks.

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej