Bigmansnoop

Got an fuel gauge issue and was worndering what all could it be I've already changed the fuel level senor out, and also the gauge out itself but it still reads empty only on 10 gallones of gas and if I'am not mistaken a 94 dx civic comes with a 13 or 13.5 gallon tank correct so what else could it be that causeing my tank to read empty when its not if its a ground where are the places to look for this at any and all reply's will be greatly appericated thanks Mark...