Look on the side of the block near your fuel filter there is your lift pump. It will have a 2 pin connector going to it. They are common for going out. It will usually take your VP44 with it.
http://dieselconversion.com/sites/dcs/files/kbase-pics/24-valve-lift-pump.jpg

08 2500 6.7 6sp 79 soon to be 440-4speed Adventurer 100 79 Warlock II 79 Lil Red