I have the Pentair Whisperflo high performance pump and the PVC pipe that connects into the volute is leaking. I've tried using plumbers tape, etc. but nothing seems to hold the leak. What would y

SOURCE: pentair whisperflo pool pump motor replacement

No there is a cover on the other side of the motor thet comes off and with a 9/16 wrench holding the shaft - spin the impeller off

SOURCE: Hello, I have a pentair

turn the pump off, remove the lid and pump basket. reach your finger inside to see if there is any debris caught in the impeller. MAKE SURE the pump cannot come on at any point while you're working on it.
That should do the trick, if not, investigate an air leak on the suction side of the pump. Causes: bad lid 0-ring, threads on suction fitting leaking air in, or if there is a union on the suction side, make sure it's tight and the o-ring is in good condition (add lube as necessary).