TM 9-2815-225-34&P 3-63.  FUEL PUMP TESTING AND CALIBRATION (Contd) LOCATION/ITEM ACTION REMARKS d.  Fuel Pump Run-in (Big Cam I and Big Cam III) (Contd) 36. Shutdown solenoid Open by turning clockwise. This step is needed to cancel out manual override knob (45) the normal electrical shutdown through the solenoid and allow fuel flow for testing purposes. 37. Bypass valve (35), suction Open. control valve (77), and flow control valve (37) 38. All other valves on test Backseat to prevent leakage. stand (1) 39. Speed-shifting crank (20) Set to HIGH range. After crank has been set to HIGH range, turn it back (counterclock- wise) about one turn so that the handle load is neutralized. 40. Throttle lever (48) Make sure it is in the wide-open position and secured with a spring. 41. Selector valve (36) Turn to ROTAMETER position. 3-480