I saw other YouTube videos
I saw other YouTube videos that showed a few things you might try:
1. The pump should be making a humming noise when running. If you can place your hand on it, you will feel it vibrating and this indicates it’s pumping. (it’s a good idea to do this test before putting the headlight and fender back on). If you’ve already assembled it and cannot reach the pump, you can use a wooden dowel to touch the pump and listen to the other end of the dowel and you will hear the vibrations of the pump running)
2. You may have an air bubble in the system and this may cause the fluid not to circulate. Check out YouTube videos of how to bleed the system.