need to know where this thing goes BAD.

[alderson95]

i have been building a 6.5 for about the past 3 months. the motor is out of a 1996 gmc sierra 3500 4x4 crew cab. i got the truck about a year ago with a bad crank in it. i finally got around pulled the motor and fixed the crank re-did the heads the hole 9yards. im extreamly close to putting the motor back in but. there is a line running from the top of the injection pump. the line i geus acts as a vacuum for the injectors. well on one end of the line it has one that like t's off twards the front of the motor. i have no clue what it hooks to. thanks for your time