To verify the extruder can push filament through it, before installing to the printer, hold in the orientation that it would be installed, put a piece of filament into the top of the extruder and spin the yellow gear clockwise with your finger and the filament should come out of the bottom of the extruder. Spin the gear the other way to back the filament out. The screw going into the side of the extruder with the spring is the tensioner, I have always had mine fully tight, if that were loose it might not be able to push the filament to the nozzle.
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