2008 Yukon Denali EVAP System Lines

I'm having the common slow to fill the fuel tank problem on my recently purchased '08 Yukon Denali, likely caused by the previous owner(s) regularly overfilling the tank. I'm going to be replacing the EVAP canister soon, and although the recommended practice is to use some compressed air to blow out all the charcoal pellets that may have accumulated in the EVAP lines I'm also considering, just to be sure, simply replacing the lines all together.

For the 2008 model year on the Denali/Escalade, I've come up with two part numbers and I'm looking for some help/insight in determining which I need.

Part # 25860206 (or 25801698) is listed as fitting 2007 and 2008 vehicles with "fuel tank with external vent inboard of MRA".

Part # 25914595 is listed as fitting 2008 and 2009 vehicles with OUT "fuel tank with external vent inboard of MRA".

So, it appears it could be either for a 2008 model year Denali/Escalade, with the determining factor being whether the fuel tank has or doesn't have an "external vent inboard of MRA". Any clue what that means? As best I've come up with is "MRA" stands for Module Reservoir Assembly, so I'm thinking they are referencing the fuel pump assembly and whether or not it has an external vent? If so, how do I determine that?

Part I'm referencing is item # 1 in the attached diagram.

Thanks in advance for any help, insight, or information.

Anyone?

Hi, Im having a similar issue and need to drop my tank and clear the lines. I have replaced the canister vent solenoid. Still having slow fill so I"m sure the line from the canister to tank is clogged with carbon but I want to have the new hose in hand before I drop the tank.