My fuel gauge varys dramatically when cornering or accelerating hard is it faulty ?
A. No, they all do this for some reason when the tank is less than three-quarters full, I would guess the reasons are the shape and design of the tank and/or the position of the sender unit. What you are seeing on the gauge is the fuel moving around the tank under heavy loading, and is quite possibly a design fault, this is the first Fiat I have seen this happen in to this extreme.