| First, make sure the pump is not air locked. Restart it a couple of times.
If there is something lodged in there, it's more likely in the pump than the pipe. Unless you have a check valve, the smallest constriction is the pump impeller so that is where you are most likely to have something lodged. The impeller speed is all-or-none unless it is slipping on the shaft (unlikely). A bad shaft bearing could also cause it to run slow, but you would hear a grinding noise and the motor would get hot and kick off on the thermal overload.
I agree with Larry. Push water backward through the pump if you can.
If that doesn't work, remove the suction pipe and unbolt the pump head. There are six nuts and bolts holding the two halves of the pump head together. After removing the bolts, you may have to use a screw driver to work the front half of the pump head off. The back half of the pump head, shaft and impeller will remain attached to the motor.
If there is nothing lodged in the pump head, turn the impeller with your finger and/or briefly plug in the pump while the front hald of the pump head is removed. The impeller should turn freely.
If that is not the problem, then you will have to start pulling the plumbing apart or run a snake through the lines.
-s |