I have a 3hp Baldor that I use for my hay fields. This year I put it in the well in the field rather than the river. It sucked up quite a bit of sand before I got to it to shut it off. I raised it up so it's got 2 1/2" of water under the check valve and install a cage around it. The pump still isn't building up enough pressure, it will start up then died down. Can anyone give me some ideas about what to do now. I'm not experienced with pumps and irrigation but I've sure learned a lot in the past 2 years! I'm wondering if perhaps I've damaged the impeller?

Many thanks Del