p0455 code, and need an explanation of the evap system and one way valves

[Brant914]

I keep throwing a p0455 code, for large evap leak
on my 1997 1.5 with 130K

of course I replaced the gas cap, but that wasn't it
the leak is larger

intelli fix, is recommending the canister drain cut valve....
I've pulled the fender liner a couple of times and inspected all of the lines and connections
I've also lightly pressurized the gas tank (7-8 psi) and sprayed soapy water on all of the lines and connections

none of the connections are leaking
some of the 1 way valves show soap bubbles

I'm not certain though of the working steps of the 3 different one way valves and two different electrical connections in the system
I realize it could actually be a failed pressure sensor with no leak really existing....

does anyone have a laymans explanation (pictures?) of the evap system in the back of the car/tank.

I will then need to next move to the front/engine bay part of the system also
but so far nothing visually stands out.

[progt91]

Pinch the line for the purge solenoid valve and run a test. If it passes the solenoid valve needs replacing

[Brant914]

perfect!

thank you !