3-63. FUEL PUMP TESTING AND CALIBRATION (Contd)
d. Fuel Pump Run-in (Big Cam I and Big Cam III) (Contd)
Power switch on test stand
Turn to ON position.
Power "ON" light (21) should light
Fuel heat switch (19)
Turn to ON position and observe
Fuel heat "ON" light (18) should
fuel temperature on fuel
light up. Proper operating
temperature gauge (4).
temperature for calibration fluid
is 90-100F (32.2-37.8C). The test
stand (1) built-in thermometer
will automatically maintain this
temperature once the fluid has
Pressure regulator (9)
Adjust until a reading of 50.00 Hg
(180,000 kPa) registers on
pressure gauge (8).
Start button (26)
Depress to start test stand (1).
Fast switch (25)
Depress and release as necessary
and slow switch (23)
until exactly 500 rpm is indicated
on tachometer (7).
Check the flowmeter glass tube for air in the fuel flow. If air bubbles are present, work the
fuel pump throttle lever from full-open to idle several times to relieve any trapped air in the
pump. If air bubbles persist, it is an indication of an air leak in the system. Turn the test
stand off and check all line connections between the test stand and fuel pump for tightness.
Check the rating of gear pump to main housing and check to see that test stand reservoir is
full of fluid.