Exactly what type of problem are you having with the printer? If you have ink flowing through the printhead and ink flowing through the captop then to test the pumps --
First check that the drain tubes aren't clogged then, the easiest way to test is to pull up the drain tubes and do a cleaning and see if any ink comes out. Do you have the old or new style pumps? If you have the old style pumps you will see a white gear on them. The old style pumps are prone to failure and usually leak when they fail. I haven't seen a failure of the new pumps yet. There is a conversion kit to switch to the new pumps. It is easy if you have the directions. The new pumps require firmware v 6.30 or higher so you may have to upgrade the firmware. A new pump and conversion kit should be around $100.