| pumps like koi are hard to diagnose without being there. I still have my original sequence i bought dcades ago. Runs fine. I have a brand new one in the box never used so kinda don't believe that's the problem. Would suspect something is in the input line or housing. With pumps you can restrict output up to half but don't want to deny any input. So don't run till you know what it is. I'd be tempted to pull it off line ( hopefully you have quick dis/ connect ) and check by blowing back the input line and making sure nothing in propeller. |