I would say that the arm has been bent on installation or maybe the actual wiper is damaged and not making contact.
My 140L Long Ranger shows full for about 50 litres , then 3/4 corresponds to about 70 litres left,ie 1/2 a tank and works normally until empty.
Unless you had endless patience to make up a new arm and then experiment , this is how they work.
In your case however it sounds like your wiper has been damaged. It is tricky to get the sender through the tank hole and needs quite a bit of turning and jiggling, as the hole is nearer the front wall of the tank than standard.
Regards Philip A


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