FUEL PUMP CALIBRATION - CONTINUED
IDLE SPEED TESTING AND ADJUSTING
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:
assembly cover (3)
Place selector valve (4) in IDLE
Increase fuel pump speed to 500 rpm.
Pull throttle lever (5) to idle position.
Fuel pressure gage should read 28 psi
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