The best tool for the job is a shop vac utility vacuum ... The next step is to make sure there are no clogs between the pellet hopper and the auger. Shut your grill down and allow it to cool.

Lower scores indicate that the hopper needs more frequent re-filling. This Master Forge pellet stove has a hopper capacity of 140 pounds of pellets, can generate between 16,100 and 39,500 BTU/hr ...