Have you got the fluid level correct? According to the user manual:
Power steering fluid
The fluid level should lie between the MIN and MAX marks on the dipstick.
Check fluid level with engine idling and after driving while the fluid still is hot. Wipe the reservoir clean.
I think I remember reading once that the correct level reading was obtained with the cap just resting on the reservoir rather than screwed fully down, but I cannot find any reference to that now.
Did you bleed air out of the system after you changed the pump? You have to turn from lock to lock a number of times with the cap off the reservoir to do this effectively.
Is the knocking definitely related to the power assistance? Worn track rod ends and universal joints can make the steering feel notchy.
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