TM  5-2815-241-34&P FUEL  PUMP  CALIBRATION  -  CONTINUED ACTION LOCATION ITEM REMARKS IDLE  SPEED  TESTING  AND  ADJUSTING NOTE If pressure is low and the adjusting screw bottoms, stop the test stand, add shims to the spring end of the adjusting screw (see Fuel Pump, page 2-289) and retest cutoff rpm and  throttle  leakage,  steps  27  and  28. Each time governor barrel assembly cover or spring pack adjusting tool is removed, run pump until purged of air. 29.  Test  stand  (1) Fuel  pump  (2) Test and adjust idle speed as follows: governor  barrel assembly  cover  (3) a. b. C. Place  selector  valve  (4)  in  IDLE position. d. e. f. g. Increase  fuel  pump  speed  to  500  rpm. Pull throttle lever (5) to idle position. Fuel  pressure  gage  should  read  28  psi (179.27  kPa). If  fuel  pressure  is  not  28  psi  (179.27 kPa),  adjust  idle  screw  using  ST-984 barrel  assembly  adjusting  tool. After  proper  adjustment  is  made,  stop test  stand  (1)  and  remove  ST-984  barrel assembly  adjusting  tool. Install   barrel   assembly   cover   plug   (8). Purge  fuel  pump  of  air  (see  step  24). T A    2 4 2 5 6 6 2-344