I wouldn't jump into a pump unless it is the source. USe a stethescope to narrow down the noise. You can use a wooden dowl or long screwdriver for this as well. Place your ear to one end, while the other is touching a questionable component. The noise becomes more evident to narrow down. One component I would be thinking of is the serpentine belt tensioner as it may be getting sticky.
Have someone else start it while you look and listen.
Tuesday, June 24th, 2008 AT 5:02 AM