TP-5936 7/04 11Section 4 Fuel System
4.5 Fuel Solenoid
The fuel solenoid pulls the injector pump lever to the fuel
on position when energized. The fuel solenoid is spring
loaded to return the injector pump lever to the fuel off
position when deenergized.
The generator set uses a three-lead fuel solenoid. This
solenoid has a white lead (P) which energizes the pull-in
coil only during cranking. During operation, the red lead
energizes the hold coil and the black lead is the common
ground.
Figure 4-3 shows the current (amps) and resistance
readings. Disconnect the fuel solenoid from the engine
wiring harness and take the resistance readings to
determine if the solenoid windings are open or shorted.
In addition to the ohmmeter test, check for smooth,
non-binding movement of the plunger. Be sure to adjust
the linkage between the fuel solenoid and the fuel
injection pump lever to allow the solenoid plunger to fully
compress. Incorrect adjustment may cause burnout of
the pull-in coil. If the fuel solenoid is removed, see
Figure 4-4 and use the following procedure.
Fuel Solenoid Test Procedure
1. Remove the linkage to allow the fuel solenoid
plunger to be manually compressed.
2. With the fuel solenoid fully compressed, align the
linkage and check the injection pump lever for
travel. The fuel solenoid should fully compress and
the injection pump lever should be at 1.6 mm
(0.06 in.) before the lever contacts (internal full
open) stop.
Note: The fuel solenoid must compress (bottom)
fully or the fuel solenoid pull-in coil will burn
out.
3. If alignment is not correct, check the linkage and
mounting brackets. Loosen the locknuts and
adjust the ball joint length in or out to attain the
correct alignment. Tighten the locknuts.
Reading
Fuel Solenoid
12V System 24V System
Pull-In 50 amps 22 amps
Hold 1.0 amps 0.37 amps
Black-white (P) leads 0.12--0.26 ohms
Black-red leads 11--13 ohms
Figure 4-3 Fuel Solenoid Readings
GB-250000A-K
1. Fuel solenoid
1
Figure 4-4 Fuel Solenoid
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