Picked up a seized engine E70 (N55)

[BergA]

Originally Posted by ingenieur

The attached schematic screenshot may help.

Thanks, that's great. My car is 2011/05, so I did have the "tank vent shutoff valve" connected correctly (red wire & red/white wire)

On to other theories. My next thoughts are:
Broken vent hose out of the fuel tank?
Failed pressure sensor at charcoal canister?
Bad charcoal canister?

I remember specifically that I accidentally got water in the fuel vapor escape hose during pressure washing (leading into the charcoal canister) so that's the only lead I have at this point.