if you search venting you will find loads on it, basically look down the filler neck and the is a little black lever on the right push this down while filling and the air in the tank is replaced by fuel. if you have a petrol this is not reccomended
As said above - take the fuel cap off and you will see a little black toggle on the right hand side. When the tank is filled normaly, hold this toggle down and slowley (about 1/2 speed) fill the tank. I can usualy get 12 - 13 litres extra in doing it this way. Note that the auto cutoff wont work, so you will need to watch the level!
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