Code P0455 Evap system leak (gross leak detected/no flow).

[Gonzo911]

After scanning the system and finding this code, I replaced the purge solenoid, and the fuel cap. Fuel cap didn't tighten. While replacing the solenoid, I noticed that the pipes coming from the rear of car are rotted away. I just purchased the car. I'm looking for some input on what the pipe that the solenoid on it doesn't have. What is it attached to? All I have there at the top of the pipe is a chewed off braided hose like a fuel hose.
I have the tools to replace the metal pipes with nylon fuel pipe, but need to find the second attachment up by the engine.

 

[2007LucerneCXL]

See the attached diagram evap line #5, suspect that other fuel/evap lines may also be in question. Getting a smoke test and/or a professional scan on the components would help vs trying the parts cannon.

https://webautocats.com/en-us/epc/buick/4h1-h/03/4h03-012/

 

[Gonzo911]

What I found after working on the system, is the pipes from the rear of car are rotted off at the base of the firewall. I am a retired tech and have nylon fuel lines that I could replace the rotted parts. What I'm trying to figure out is line 2 comes up along with the line going to #5. At the end of the steel line is a piece of fuel type line that is just there, looks chewed off. Where does that line go to?
It appears to go up towards the engine. I just bought this car and am trying to get the evap code cleared. As you can agree, rusted open and apart lines would qualify for a gross leak.
Thanks for the response. Hoping you know where the line that's not to the purge solenoid goes to.

 

[Gonzo911]

See the attached diagram evap line #5, suspect that other fuel/evap lines may also be in question. Getting a smoke test and/or a professional scan on the components would help vs trying the parts cannon.

View attachment 49693

https://webautocats.com/en-us/epc/buick/4h1-h/03/4h03-012/

Is it possible that the people who used to own the car had that line sealed off? From what it looks like that could be a return line to the fuel tank. I have also found what looks tike the external transmission filter has been by-passed.