Selgas
Robert
My opologies to us down here a foot and a non return valve have the same function and are often called the same thing. Yep I missed the point regarding the overloading of the motor as well.
I agree using a clamp on amp meter to check the phase wire under load would indicate a fault within the motor if the draw off exceeds the amp rating of the motor. Could also be a starting capacitor is at fault. 
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