In a message dated 96-02-05 00:45:00 EST, dakhlia@wuecona.wustl.edu (Sami
Dakhlia) writes:

>The carbon canister *looks* like a pretty unimportant appendage in the
>engine compartment and I sure haven't touched it since I've owned the bus
>(4 1/2 years & 45,000 miles). 
>
>Perhaps this should change. What have others done about it? Should the
>canister be replaced, or just its contents?
>
>

Believe it or not, many manufacturers list this as a 30,000 mi service item
 It is not refillable.  I would leave it be unless it leaks.
Dennis.