TM 10-3930-671 -10 3-9.  FUEL TANK CHECK AND SERVICE. a. Fuel Tank Check. (1) Place master electrical switch (1) to ON. (2) Turn ignition (2) to RUN position (para 2-4 [b]). (3) Check fuel level on fuel level gauge (3). (4) Turn ignition (2) to OFF. (5) Place master electrical switch (1) to OFF. (6) Add   fuel   as   necessary   (para   3-9   [b])   per   MIL-T- 52864 and MIL-T-83133. 3-18