First time here. Need to solve a problem w/o going into debt with the pool company. Replaced old energy hog 2 HP pump last year with a Reliant 1.5 HP pump. Pump was running fine, water flowing into and out of the pool and filter. I stopped the pump, opened up the filter, cleaned the filter, buttoned it up, filled the strainer basket with water to prime the pump. Closed the filter basket and switched the pump back on. Water is not getting sucked back into the pump. I switched the valves to differing positions skimmer, vac, main and stuck a hose in and water did flow thru the vac and skimmer, I assume the main, but hard to tell. I switched the valve to the skimmer, put the hose on right into the skimmer suction line, filled the strainer basket closed that, switched on the pump. The motor sounds fine, just does not seem to suck any water in. Thoughts?