Fuel Stop Solenoid (Solenoid With 3 Wire Connector)
The fuel stop solenoid must be energized for the engine
to run. It is mounted on the engine block near the injec-
tion pump (Fig. 20).
2
1
The fuel stop solenoid includes two coils for operation:
the pull coil and the hold coil. When the ignition switch
is turned to START, the fuel stop solenoid is initially ener-
gized and the pull coil retracts the solenoid plunger.
Once the plunger is retracted, the hold coil will keep it re-
tracted for continued engine operation. When the sole-
noid is de−energized, the plunger extends to shut off fuel
supply to the engine causing the engine to stop running.
The fuel stop solenoid is grounded through the common
(black) wire of the solenoid wire connector.
Figure 20
NOTE: Refer to Electrical Diagrams in this chapter
when troubleshooting the fuel stop solenoid.
1.
Injection pump
2.
Fuel stop solenoid
6
Testing
3
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the test leads together. The me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
from the measured value of the component you are test-
ing.
5
4
2
1
1.
Make sure ignition switch is in the OFF position. Dis-
connect the connector from the solenoid.
Figure 21
2.
Using a digital multimeter, touch one test lead to the
1.
2.
3.
Cap screw
Fuel stop solenoid
Gasket
4.
5.
6.
Common (Black wire)
Hold coil (Red wire)
Pull coil (White wire)
pin of the black wire and the other test lead to the pin of
the white wire (Fig. 21). The resistance of the pull coil
should be about 0.33 ohms.
3.
Using a digital multimeter, touch one test lead to the
pin of the black wire and the other test lead to the pin of
the red wire (Fig. 21). The resistance of the hold coil
should be about 12.2 ohms.
4.
Connect solenoid to the wiring harness.
Electrical Systems (Rev. C)
Page 5 − 38
Reelmaster 3100−D
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