I checked the charcoal cannister and the check valve today.
Both appear to be okay.

When I cover any one port on the cannister and blow in another, air
comes out of the third.  Works for all three.

Also figured out which tube was which on the check valve.
At first, the valve was always "open", but after a couple of vacuum
cycles it closed when vacuum was released.  Put it all back the way
it was - I figured I'd try it and see if it fails again.

The thing I find really odd about this setup is that the hose on the
bottom of the cannister just goes through a rubber grommet in the
frame rail - and that's all.  It doesn't go somewhere else - just
into the frame rail.  I guess that's a relatively clean and dry place
to suck in air..
--

bcnu - Grungy  (Houston, TX)
'60 dddPanel '69 Bug '90 Vanagon '93 Eurovan '00 Audi A6 Avant
grungy@mindless.com           opinions are just that.obviously.