3-63. FUEL PUMP TESTING AND CALIBRATION (Contd)
h. Throttle Leakage (Contd)
No. 1 burette (6)
When count cycle ends and count
The scale on the burette is
"ON" light (16) goes out, release
measured in cubic centimeters
lever. Read amount of fuel delivered.
(cc). Normal throttle leakage for
this pump is 45 to 59 cc at 1000
rpm. Repeat steps 67 through 70 at
least three times to ensure
accuracy. (For Big Cam I engine
fuel pumps, 12.5 to 16.5 cc throttle
linkage is normal). If throttle
leakage is not within limits shown
above, do step 71. If throttle
leakage is within limits shown
above, go to step 72.
Rear throttle stopscrew (99)
Loosen locknut (100) and adjust
Turning stopscrew (99) in will
and locknut (100)
rear throttle stopscrew (99) to
increase fuel flow, and turning
adjust fuel delivery.
stopscrew (99) out will decrease
fuel flow. Even a slight movement
of stopscrew (99) will make
several cubic centimeters
difference in fuel flow. Sometimes
just loosening and retightening
the locknut (100) will be enough.