I doubt they would make you replace the tank to change a fuel pump. Just like in cars and some other bikes I have seen there will be some sort of access door. I would imagine a plate with several screws around it and a fat O ring seal it mabe a cam locking ring like on a car that holds the door. One of the EFI owners will pull the tank sooner or later and can enlighten us. I suppose it is even possible you may have to fish it out the filler neck but doubt that one.

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