First, I'm sorry if this took a long time to get back to you. For some unknown reason, I'm not getting all of my replies.
Regardless, if I had to guess, I would say it is the pump. I've delt with many aftermarket and remanufacturered pumps that do exactly that, make a whining noise. Chances are the only way to eliminate the noise is to get a factory part. At least that is what I have found.
I wish I had better news. If you want, have the shop that did the work replace the pump under warranty to see if you get a better pump. Also, I don't believe there is a screen in the old resivour. However, I feel the mechanic would and should have cleaned everything out before replacing it.
Let me know if you have other questions.
Wednesday, January 20th, 2010 AT 4:30 PM