I have a 2000 XSport 4x4, and on the instrument cluster, there is a warning light that says, "Check Fuel Cap." (Not to be confused with the lettering that tells you which side the fuel cap is on) According to the owners manuel, this light comes on when the fuel cap is not properly on and or missing. (Someting about fuel pressure). I have never seen this light come on and have driven the vehicle (as a test only) with the fuel cap completely off, to see if it would come on..it did not. Does anyone else have this warning light, and does it actually work? The vehicle warranty will be up in about 3000 more miles, and I am trying to get EVERYTHING working that is suppose to work while still under factory warranty. My Ford dealer denied the existence of such a warning light, until I got a flashlight and showed it to him, as well as the owners manuel. He then claimed it takes 3 days of not having the fuel cap on for it to illuminate. At this point I would not trust him to tell me what time it is!! Thanks.