Check to see what your inlet pressure is. If your inlet pressure is lower than what is recommended, the pump will put out more than it is getting into it. Also check to see if it has an inlet screen. If it does, it may be plugged up, & need cleaning. The only other thing would be the pump itself is worn out, or has something jammed in the impeller, not knowing how old it is.
Answers & Comments
Check to see what your inlet pressure is. If your inlet pressure is lower than what is recommended, the pump will put out more than it is getting into it. Also check to see if it has an inlet screen. If it does, it may be plugged up, & need cleaning. The only other thing would be the pump itself is worn out, or has something jammed in the impeller, not knowing how old it is.