When I am putting gas in my Impala the pump nozzle clicks off immediately. I am able to fill the tank up but it takes about 15 minutes of trickling gas into the tank. I suspect the evap canister vent solenoid or the Vapor canister are bad. The car is running fine and there is no check engine light. The only other thing I have noticed is a small decrease in fuel economy. The car has 210,000 miles on it and runs great other than this problem.