3-63. FUEL PUMP TESTING AND CALIBRATION (Contd)
l. Calibration Check Points
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.
Slow switch (23)
Depress until 1300 rpm is
Throttle lever (48) should be
indicated on tachometer (7).
held at full-throttle position.
Flow control valve (37)
Adjust until fuel flow through
flowmeter glass tube (38) is
exactly 380 pph as indicated by
float in tube.
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.