I created a pipe in 3d. water does not follow the path but starts falling downwards. So, I added path constraint (follow path curve object) inside the pipe for the source object. My source object is following the path but not water. I have been trying to solve this over week now.
assuming you want something like this:
you need to:
close the pipe on the left side with a face
solidify the pipe to give it some thickness
increase resolution divisions > 100 (mine was made with 100, and you still see it's permeable
Let Blender calculate the simulation and run it...