There was an issue with the BX series on their fuel sender. If you are getting an inaccurate reading on your BX, call your dealer and ask if your serial number comes up on that list of tractors that had suck a problem. Most of the new tractors are self bleeding. There may be a round petcock valve on the end of the injection pump to open, other than that, it is self bleeding. On the BX series, you will have to crack the orifice bolt at the injection pump, and turn on the key so the electric fuel pump can push out the air. Wear safety glasses, and put something down on the ground, 'cause it will make a mess. In rare cases, you may have to crack the lines at the injectors one at a time until they are free of air.