I have a sandpoint 1-1/4" pipe. Water pumped fine w/pitcher pump. Water pumped fine with gasoline powered Homelite AP220 pump. Then I got a used 1/3 hp shallow well jet pump and cannot get it primed. Jet pump worked when put into a pool and primed, seemed to have fair amount of psi output. Sandpoint well is about 25' deep. How can I check if Jet pump is working properly?