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TM   5-2815-241-34&P FUEL PUMP CALIBRATION - CONTINUED ACTION LOCATION ITEM REMARKS 27. Fuel  pump  (2) NOTE Once 8-inch HG vacuum setting is obtained, do not change setting. Readings will fluctuate during other tests. Note the increases or decreases as they occur. Test governor cutoff rpm as follows: a. Open  fuel  flow  control  valve  (4) completely. b. Increase  pump  speed  to  2000  rpm. Depress  and  release  FAST  (9)  or SLOW  (10)  button  to  obtain  2000 rpm. c. Adjust fuel flow control valve (4) to obtain  8-inch  (20.32  mm)  HG  vacuum on no. 2 vacuum gage (11). d. Increase  pump  speed  to  2100  rpm. e. Open  the  fuel  flow  control  valve  (4)  and place  the  selector  valve  (12)  in ROTAMETER    position. f. Increase pump speed until the fuel pressure  drops.  Test  stand  tachometer (13)  reading  should  be  2130  to  2150 rpm. T A    2 4 2 5 6 4 2-341


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