I am a member of this club because my son has an XF Portfolio, but unfortunately is not mechanically-minded! His car has the same problem as all the others on this thread, in that his fuel gauge has stopped working. As he lives in the South East of England and I live in Durham, I cannot see the car to assess the fault, but I would guess that there are two options for the fault; either the sender unit is not working due to a defective float, or the sender unit wiring is corroded/loose. In the past I have had this fault on other cars I have owned, and found that either of these faults are relatively easy to fix for anyone who has a modicum of mechanical know-how. If as described by a previous contributor to this thread that the sender unit is located under the offside rear passenger seat, the sender unit should be easily accessible, so that the condition of the wiring can be assessed and de-corroded or replaced, or the sender unit can be removed from the tank and replaced by a new one, or a known serviceable second-hand unit, not forgetting to observe safety rules when working around a fuel tank! This may save a lot of money compared to booking the vehicle into a Jaguar dealership for repair. If anybody has another solution to the problem I would be happy to hear it.