TM 9-2815-225-34&P 3-63.  FUEL PUMP TESTING AND CALIBRATION (Contd) LOCATION/ITEM ACTION REMARKS l.  Calibration Check Points NOTE There are two calibration check points.  Steps 86 through 88 are for calibration check point No.  1 which checks torque spring accuracy.  Steps 89 through 92 are for calibration check point No. 2 which checks weight-assist plunger. 86. Slow switch (23) Depress until 1300 rpm is Throttle lever (48) should be indicated on tachometer (7). held at full-throttle position. 87. Flow control valve (37) Adjust until fuel flow through flowmeter glass tube (38) is exactly 380 pph as indicated by float in tube. 88. Fuel pressure gauge (2) Check fuel pressure reading. Proper reading should be (See Table 3-8; check point 1 for between 109 and 115 psi both Big Cam I and Big Cam III (751 and 793 kPa) at 380 pph fuel fuel pumps, based on their CPLs.) flow.  If reading is correct, go to Before performing steps 89 and step 91.  If pressure reading is 91, use values shown. above or below desired range, do steps 91 through 94 and repeat steps 86 through 89.  If pressure reading is still above or below desired range, do step 90. 3-504