Water Supply issue?

[AKPilot]

Apologize in advance for my lack of experience searching this forum. 
 

I am a new owner of Hull 119 a 2016 Legacy Elite.

Trailer was purchased from an estate and sat for a bit.

i am troubleshooting my water supply system.

Works fine from “Boondocker” supply if hooked to external tank.

 

when connected to Municipal or Freshwater Tank…barely a trickle.

I found a user augmented plumbing supply diagram for newer Elite II, Do not know if current system is same as older ones, but would appreciate if someone could kindly point me in right direction for a solution.
 

I have found the Alternative Plumbing diagram for 2019 Legacy Elite II. 
are the plumbing diagrams similar to older Elite models?

[topgun2]

Below is a diagram for a 2017 Elite II which is the same as my 2016 hull #116.

Bill

p.s.  included are a couple of others that you might need at some point.

[AKPilot]

Thank you very much Bill.

much appreciated