See Figures 1, 2 and 3
The Vapor Saver Evaporation Control System was originally used in 1970 on those vehicles sold in California, and thereafter on most vehicles.
This system prevents evaporated gasoline vapors from escaping into the atmosphere.
The carburetor is either vented internally or through the charcoal canister. Vapors are routed to the canister which is filled with activated charcoal, providing temporary storage.
On fuel injected engines, a bi-level system is used in which vapors are drawn into the engine at idle and off-idle as well. The source of idle vacuum is a tee in the PCV system.
The vapor storage canister is located on the left frame rail behind the steering gear through 1973.
On 1973-87 models it is located under the van, next to the right side frame rail, behind the transmission support crossmember.
On 1988 models, the canisters for all engines are located in the wheelwell area of the engine compartment.
Some models are equipped with two storage tanks. These are identical and should be serviced together.
The only service associated with the system is a replaceable filter element inside the canister. If necessary for access, unfasten the retaining bracket, disconnect the hoses, and remove the canister. Open the cover and pull out the filter element. Install a new filter element and close the canister. If applicable, reconnect the hoses and install the canister.
Some canisters may not have a removable filter. Such canisters should be replaced as necessary.