Car trouble

Our Kia Sportage was having its yearly MOT and half-yearly service yesterday, and everything went smoothly. The tyres will have to be replaced soon, though and so will the brake pads, but so far it's OK.
When we came home the fuel gauge was suddenly below Empty. Did they empty the fuel tank at the garage? Hardly, so it had to be something with the gauge. We went by the garage today, and the mechanic had a quick look at it, came back, looked serious, and told us the sender thing inside the fuel tank had stopped working. He kindly asked us if the car was still on warranty, and when we checked it turned out the warranty expires 3 July 2004. How lucky is that?
I found a picture of a Sportage same age and same colour as ours.