Edited: 3/14/2011 9:24:07 PM by SledNeck91604
Its under the injection pump between where the oil pan bolts poke through. Edit-check above link
You will also want to keep an eye on fuel pressure. If you loose a lift pump, it wont be long before your replacing the injection pump also.
http://www.bluechipdiesel.com/injectionpumpfailures.html