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You might remove the tire and the fender liner to get to he canister. Give it a shake to see if it has failed internally.
Emissions systems are petty simple. Expanding vapors get trapped in the charcoal then get purged through the motor once it is warm. The pluses valve under the brake booster will open once the engine is warm and the dashpot valve allows flow under high vacuum. Check your little rubber elbows to see if they are petrified or have turned to mush after 25 years.
If your drive time is short and you drive on bumpy roads, there may not be enough time to pull down the pressure from the expanding fuel.
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