I will say it one more time, as you have not commented.
Did you look at your primer tube???
There is an up, and a down side, if you put it on upside down, it will cause stoppages.
Look at your tube, and look for the very end of it to be beveled..ON THE OUTSIDE, it is small but makes a huge difference. This end goes down into the feeder

Another way to know is the tube should be beneath the Black plastic holder, if not, or level, it is upside down.