2005 - 2010 Jeep Grand Cherokee WK Fuel Filler Neck Replacement

NOTE: SOME DIESEL PUMPS WILL NOT FIT INTO THIS NECK. YOU MAY WANT TO DRILL IT OUT.
How to replace the fuel filler neck on the diesel model. The gas models are a bit different.
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Fuel Filler Neck (there is no diesel replacement, this one will reject some diesel pumps which are supposed to be slightly larger than gas pumps and it has an extra vent), amzn.to/3QdR3SW
WD-40, amzn.to/40gy8LQ
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[@eniojaupaj5615]

What is the fuel consumption on this? I have the exact same model and cant get less than 13L/100km in the city

[@SteveRivett]

all around I get 12 l/100 but this is with the bigger tires and a lift. The trip computer is very slow to respond on these vehicles, you may want to reset it to see if it gives you more "in the moment" numbers. On the highway stock I think I was getting around 10.