Final Resolution to the gasoline and starting problem.
1. After the evaporation canister valve was replaced, the canister was found to have gasoline in it. The gasoline, maybe only a cupful, had caused the charcoal in the canister to break up and flow to the purge valve. The purge valve was stuck open causing the engine to flood upon starting. The canister and purge valve had to be replaced. The car works just fine, now. Total cost of all the work, $900
2. Most likely cause of the problem. There are three of us that use this car. Quite often over 75,000 miles, after the pump nozzle clicked off, an extra 1-9 cents was added to round off the price to even cents. This is not much gasoline at all, but this accumulation must have caused the canister to collect gasoline which caused the valve to fail to allow more gasoline into the canister. Or, the valve was damaged by not letting it do its job when more gas was added. The Subaru fuel system is extra sensitive, so when it says no more it means no more at all.
3. Possible, but less likely, is that the evaporation canister valve failed on its own causing the canister to collect gasoline and then go down hill from there.
4. When the pump clicks off now, that is all that goes into the tank. Very expensive lesson learned.