Priming a 2" pump, with a 3" suction line and a 8' elevation change is gonna be tough, unless you can valve off and fill the suction line before starting the pump.
Send pictures of the site, as much of the suction piping as you can see, and the pump and surrounding piping to poolforum@gmail.com . . . or post them yourself using GDrive, Flickr, Picasa or Photobucket.
Also, please explain how you've primed before. If there's been a change, you might have a line cracked over winter, that's letting air into the suction pipe, and breaking the suction.
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