I have 2 challenger 1.5 hp pumps. One is for the skimmer and goes into the filter then returns to the pool, the 2nd pump is for the pop-up system. I don't have a jandy vavle for the pop up pump and I can not get the pop up pump to prime. I replaced the Paramount gear box and it still will not work. There is an intake to the front of the pump that comes up from under ground, then the return from the top of the pump goes back under gound, which I believe goes into the bottom of the pop up control. When I try to prime the pump by filling it with water it only fills about half way. The pupm is not leaking, the impeller is not clogged? It appears that no water is being sucked into the pupm from the intake. Any help please???