Vacuum diagram for diesel 99-03.
 

Hi, does anyone have a full vacuum diagram for a diesel super duty. I picked up an '03 and someone has been playing with it and yanked all the vacuum lines off! Makes it hard to figure out! The only thing else I could do is park beside someone else and copy it!

No diagrams, but from the pump on inner fender you have a Tee, where one leg goes to the vacuum tank and the other behind the firewall to AC controllers.
If you have 4WD, there is a leg for front hubs, what seems to be weak point on those trucks.

Thanks, Not sure why they had pulled it all apart but it looks like they just looped it back to the pump. It probably has a leak some where and he got pissed off at it! Or the pump failed and was to lazy to change it. My first indication that there was something wrong of course was no 4x4 without locking the hubs and then just defrost!

Does the leak come from the hub or the line down to them? Or is it in the 4x4 controls? This one of course has the electronic shift on the fly and not the manual transfer case.

Thanks, Rob.

There is a line on the vacuum pump that comes off and loops back around to the pump. I don't know why but it's supposed to be there.

Another line comes off and goes to the vacuum canister. From the canister there is a T and two lines. One goes forward to the HVAC controls. The other goes to the PVH (Pulse Vacuum Hublock) solenoid on the firewall forward of the pump. From the solenoid another line goes down to the axle where it hits a T and one line goes to each hub.

Thanks, I should be able to figure it out now that I know what I am looking for. I will test for leaks with my manual vacuum pump and see if there is a problem once I find the lines!