TM 9-2320-272-24-4
5-18. FUEL PUMP SETUP AND CALIBRATION (Contd)
m. Testing and Adjusting Idle Speed (VS Governor Only)
NOTE
To calibrate fuel pump equipped with Variable Speed (VS)
governor, the preceding steps are followed. In addition, task c,
steps 8 and 9 are to adjust VS governor only.
1.
On test stand (2), place throttle lever (8) of fuel pump with VS governor (3) and VS governor lever (7)
to full-fuel position.
2.
Increase fuel pump (3) speed to 2,140 rpm.
3.
Loosen locknut (5), turn HI-IDLE (top) screw (4) in until fuel pressure starts to drop. Tighten
locknut (5).
4.
Decrease fuel pump (3) speed to 2,100 rpm, and gradually increase until pressure starts to drop.
5.
If fuel pump (3) speed is not 2,120-2,140 rpm, adjust VS governor HI-IDLE screw (4) until rpm is
2,120-2,140 rpm.
NOTE
The automotive governor cutoff must be set 100 rpm higher.
6.
Decrease fuel pump (3) speed to 500 rpm.
7.
Place VS governor lever (7) and stand selector valve (1) to IDLE position.
8.
Adjust governor LO-IDLE screw (bottom) (6) to obtain 26 psi (179 kPa).
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