Do search.... Ford evap system testing, Motor.com
Brings me to the same site.
Good luck.

 

From a search result, this may be the link you intended to use. Works for me.
https://www.motor.com/magazine-summa...ation-testing/

 

For some reason the program changed the address and shortened it a lot.
As long as you get there is what counts.
Most shops subscribe to the mag. as a source of general knowledge for all makes.
.
BTW, this is a source of info you won't find anywhere else in general, at this time.
Parts vendors don't always have updated sales info.
Cases in point, the MAP-T sensor, the CHT sensor, the Ox sensors are all different from 2018 on for 5L v8 from what used to be, as I found out from the motors site.
Good luck.

 

Thanks for that link Bluegrass. That was extremely informative and helpful. I'll be saving that link. Very much appreciated.

Also, found this guy on YT. He's a bit raw but explained perfectly what you need to do for a P0456 if you have the equipment to test the EVAP system for leaks.

 

Well, I wanted to close this one out. It was the EVAP Canister vent valve under the bed of the truck that was bad. It had a very small leak when the valve was closed.
I ended up taking it in because I didn't trust my troubleshooting abilities and it cost me nearly a grand to have it fixed. I can't believe how expensive it was to just replace
that canister w/vent valve. And so, if you have the time, get yourself a smoke machine and troubleshoot the issue yourself. You'll save a ton of money.

Lesson learned.

 

Frustratingly the P0456 came back again a little less than a month ago, and instead of paying another $1000 to have it fixed I bought a smoke machine.

- Last October I replaced the purge control valve that sits on top of the engine which didn't fix the issue.
- The garage replaced the EVAP canister vent valve under the truck and that fixed it at least for 7 months.

Yesterday I pulled off the purge control valve and checked it. Definitely no leaks. I then hooked the smoke machine up to the tube that runs to the back of the truck and clamped off
the vent tube at the EVAP canister that runs back to the fuel fill area under the truck. The only smoke I could find was coming out of the fuel filler flap and it was just the tiniest bit
of smoke. I didn't have any silicone spray but did have some silicone grease. I cleaned the fuel filler flap and then coated the back side of it and the area around the flap with just
a very light amount of the grease. I retested and no more smoke. I cleared the code but didn't have time to do a long drive.

I'm hoping this was the cause. If the code goes away for a few months, cleaning the fuel filler flap and applying some silicone spray will become part of my routine maintenance.
I don't even want to think about replacing the fuel filler neck assy, it looks like a not so fun job.

EDIT: The P0456 code came back again on August 16 2024. The silicone bandaid lasted about 14 months. I've cleaned it again with silicone, cleared the code and it hasn't come back since. Next time it pops the code I'll replace the fuel filler neck which doesn't look tooooo hard.