Direction of fuel float

[Revilo18]

Does the warning light come on when it is v nearly empty- -even if the dial reads full? If so - then faulty sender unit sounds most likely. Gnasher says not common but I've heard from a number of people who've had problems with their fuel guages on Mk1 600s. Mine's a bit rubbish as well. When it's full the needle goes off the scale and I get loads of miles before it comes back on the scale again. Then once it's on the scale the fuel seems to disapear way quicker than I'd expect. Also - the needle seems to change too much one way or the other under heavy acceleration or braking.