hi can any1 tell me y my car says i have no petrol an a warning light has come on with a pic ov a tank with a fan inside it but sometimes it say i gt half a tank when i have nothing as i found out today lol plz get bk 2 me asap plzzz sound oh and the car is a s1 rs turbo running normal cvh an iv just changed the petrol tank to a s2 tank an yes iv plugged evreything in and all the pipes are the same chrs ste