Often times a pump will leak or spray water affluent to the intake after water has become pressurized. Usually this can be explained by cracked or deformed components, o-rings, or a bad mechanical shaft seal. When water is pouring out behind seal plate where the shaft enters the housing it indicates a worn mechanical shaft seal and is need of replacement. A common leak on a pool pump is the connection on the return side.The seal has to be replaced once in 03 years. If not, it will leak