Here is the latest information and action taken:
My Dealer, Don-A-Vee Chrysler, Jeep, in Placentia, California agreed to replace the canister, at no charge.
I asked to view the disassembly so I could understand the failure mode. I was able to do this:
The air inlet tube is mounted vertically behind the right rear wheel well. There is and end cap with a star channel for airflow. The tubing, evap pump, & canister are contained on an ell shaped bracket which exposes everything to the elements.
Everything was covered with dust. The mechanic blew out the lines and inlet trap. Dust everywhere! There is no protection- at all! I am surprised that there isn't a large volume of GC owners having the same problem. History does not reflect this. The service manager is contacting the Chrysler technical support group to obtain any more information.
This system cycles for several minutes when the vehicle is started, then it is powered down during operation. I cannot see how this assembly can be protected from dust (while parked) and dirt, or debris while in operation.
A flow test was performed by the mechanic when the pump was replaced. It showed the system was blocked by dirt, or dust. Therefore, the cansiter was replaced.
Under these conditions, I can only conclude that the air inlet must be altered with a tubing extension (to; somewhere?) and replace the inlet cap with a pre-filter or trap. Then check and clean it every month, or so.
Any help on the amount of failures, or modifications would be appreciated.
Regards, Dick Anaheim/Phelan, CA