Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

i have got a corsa b 1.4 1998 and the petrol gauge keeps saying the tank is full when its not. when i turn the key 2 places it tells me the right petrol thats in the tank but when i turn the engine on it go's to full any idears how to fix it thanks michael

could be a sticking float on the pump

Well mine never tells me the correct amount - it sort of bounces if you get me.
I dont know if that also is a common fault with corsa's?