Experienced issue with my 2010 Avalanche when I couldnt pump more than a gal. of gas at a time. Took it to Complete Automotive where they diagnosed my charcoal filtration system had a breech. They replaced the filter, but explained some of the charcoal could have migrated into the system. I did have to take it back, but they got me in right away and corrected the problem. They were great to work with-knowledgeable, professional and friendly. Highly recommend.