OK here are the test results...
Tank held at 12 no problem
The line coming out f the fire wall held pressure no problem.
My source had great pressure. Somewhere around 15 to 20
The line from the Y to the tank held pressure no problem.
That check valve is some kind of a one way valve I believe, because I checked that as a seperate part all by its self and it held pressure on one end and the other way it passed.
Checked this side A ---------)------ B and this side
Checked the Fire wall took it off the Y and tested the line going int the fire wall. It
Checked the line to the tank while on the tank and it held.
Checked the tank by its self it held.
All connections looked good except the top black hose that went from the ) check valve to the source. That one held pressure but could be replaced.
Now Im not sure how to check under the dash what would be next.