sucks in air?
the engine and pump must be aligned and your motor mounts good, if like mine there is a metal piece in front of the carbon ring that has a clip in it to keep it from going forward, the carbon ring sits inside of the boot while the boot pressure keeps the carbon ring against the metal piece in front of it, there is a clamp of both sides of the boot....this is how mine is set up, yours my differ, however check and make sure your carbon ring is not damaged and that you do not have a broken motor mount