A pellet bin insert system for a wood smoker grill includes a container with an open top, first and second parallel opposing sidewalls, a back wall, a front wall, a bottom surface and an inclined panel affixed around its perimeter to the side walls, the front wall and the bottom surface. The container includes a feeder opening in the bottom surface. A slide bar is slideably coupled to a portion of the inclined panel adjoining the bottom surface and has a bottom end slideably coupled to cover the feeder opening in a first position and to open the feeder opening when moved to a second position. The container is adapted to be inserted into a pellet hopper with the feeder hole aligned to drop pellets into a feeder mechanism when the feeder opening is uncovered.