Text in force at CAR3R-8: from CAR3R-0, effective 15 May 1956. OCR text
(a) Controls for fuel tank selector valves shall be marked to indicate the position corresponding to each tank and to all existing cross feed positions.
(b) When more than one fuel tank is provided, and if safe operation depends upon the use of tanks in a specific sequence, the fuel tank selector controls shall be marked adjacent to or on the control to indicate to the flight personnel the order in which the tanks must be used.
(c) On multiengine airplanes, controls for engine valves shall be marked to indicate the position corresponding to each engine.
(d) The usable capacity of each tank shall be indicated adjacent to or on the fuel tank selector control.