i just bought a new power steering pump and lines. Ive tried bleeding it a couple times and srtill no result. When i rev the engine and try to turn i get a really bad grinding sound from the pump. But when its lifted off the ground no sounds at all and steering is all good. I need HELP! 2000 Jeep XJ Sport Auto

 

new as in new or new as in reman. i've had issues with "new" reman auto parts store pumps being crap out of the box.