diagnostic trouble codes

The other day i took my 98 yukon in for yearly inspection. Ha, it failed because of a diagnostic code. The code that came up was p0446, which is evaporative emission control system vent control circuit. Will pumping gas while the vehicle is running cause this code to be present?

Take a look at this post: http://www.automotiveforums.com/vbulletin/showthread.php?t=622469 (all of it).

//2000CAYukon