are there 2 Vacuum switching valves on an 80 / LXX450? P0401 problem

[Desert Dino]

I just took all that stuff out and threw it in box in the garage and put jumper in the egr harness

X2 it works perfectly in outsaid the rig

 

[Hollis Cameron]

It is the check valve for evap. If you click on the link he posted the numbers in each picture are explained in the post.

Ah thank you