I have a lot of air coming out of the supply vents, at times big gulps of air. I have solar heat on my roof, 6 bags. if my valve is turned to solar in the morning it will not prime. if I HAVE SOLAR TURNED OFF THE PUMP WILL START BUT HAVE TO RUN SEVERAL MINUTES THEN IT WILL PRIME. I HAVE A NEW PUMP AND MOTOR, HAVE A HAYWARD SAND FILTER WHICH THE SAND IS AROUND 2 1/2 YEARS OLD, BUT SINCE THEN WE HAD HIGH PRESSURE WASHING ON DECK SUROUNDING THE POOL WHICH CAUSED A LOT OF PAINT CHIPS INTO POOL WHICH WAS VACUUMED UP BY POOL VACUUMED.