Therecould be an air leak on the suction side of the pump.
Checkto make sure the suction line is free of obstructions.
Checkto make sure the impeller is still attached to the shaft of the motor. If theimpeller has broken off, it will need to be replaced.
If thepump is installed at a distance from the pool or is elevated above the normaldeck level, the time needed to prime the pump could be
longer. For elevatedinstallations, a check valve may be needed on the suction line to allow foreasier priming.