I got it working again I put bricks under my bucket and cut the tubing shorter so that there wasn’t any harsh bendingJust a guess—The directions say to leave 12"-24" between res. & pump. Also, there may not be enough drop between the reservoir and the pump. I had this issue first time I set it up—same symptom—it worked and then it didn't. Raising the reservoir just a couple inches solved the problem. Try a longer piece iof tubing and raise the res. up on a couple of blocks of 2x4 on their side.