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Here's an update:
I took out the solenoid valve from the canister. I applied 12 volts to the terminals and heard the "pop" sound that indicates the valve either closed or opened. I then switched polarity to see if the valve went the other way. It didn't seem to. I did this several times. I had trouble determining if the valve was opening and/or closing correctly - but at least I knew that by applying voltage something was happening, so that I thought it was a good sign.
Then I unbolted the canister from the car. One of the bolts (out of 3) broke (rusted). Disconnecting the tubing going to the canister caused some hissing and noise. I looked into the canister and saw the green foam like "filter". I allowed the canister to air out a little.
I put everything back together and the next time I got gas, the pump didn't stop. It seems to be working fine now without replacing anything.
I broke down and bought a code scanner so that I could clear the codes so the check engine soon light would go out. I hooked up the scanner, hit the link button and it did its thing and it didn't find any codes. I disconnected the scanner and started the car and the light didn't return.
So, for now, the car appears to be fixed without fixing it!
Thanks for all of your comments and good luck with your own cars.
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