I have a 1hp above ground vertical jet pump with a 1' pipe , about 100ft into the ground . The well and the pipe is about 20yrs old and it has plenty of water in the well . I replaced the old pump with a newer pump and I pulled the pipe to check for holes or any bad pipe and the pipe is good . I filled the pump and pipe with water and and plugged in to generator and the pump runs and only pump a little water and then it will not pump anymore . I do not have a tank . Do I need to close the fosset when I first start the pump or open it or what do I need to do to get this started ? Any suggestions will help .