There is a vacume hose at the very rear of the head -it has a 90 bend built into it and I do not know where it hooks up.
it's sort of atached to an other that goes up and Ts tinto lines that run left and right across the truck just behind the hood.
Its the one right by the IAT sensor HEEEElp please so mabe ican get this running someday soon.

 

Each year is a bit different, but the vacuum pump line powers the heater controls, the cruise control, and should also terminate on a small plastic vacuum tank.

Most cases where I see it come off when people are working on the rig, is the bottom of the tank, and you have to feel underneath the tank to find the nipple.

If in doubt, plug the line on the vacuum side and you can drive it until you find what is not working. If it is the tank line, you will have slow heater controls when you switch from one mode to another.

 

thanks, ill go look for the tank..do not recall it anywhere..but the eng. has been apart 2 mo...I know I labled everything,this may be from someone else error. this little hose has to plug in right behind the head somewhere as it dose not have any slack in it....just where i do not know