Fuel Sender - Toro Groundsmaster 4100-D Service Manual

Fuel Sender

The fuel sender is located on top of the fuel tank (Fig.
44).
Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.
2. Remove white (+) wire and black (--) wire from the
fuel sender.
CAUTION
If testing circuit wiring and fuel gauge, make sure
wire connections are secure before turning igni-
tion switch ON to prevent an explosion or fire
from sparks.
3. To test the circuit wiring and fuel gauge, connect
white and black wires and turn ignition switch to ON.
Fuel gauge needle should point to the right edge of the
green area (full). Turn ignition switch OFF and continue
testing fuel sender if circuit wiring and gauge are accept-
able.
4. Remove screws and lock washers that secure the
sender to the fuel tank.
5. Remove sender and gasket from the fuel tank. Clean
any fuel from the sender.
NOTE: Before taking small resistance readings with a
digital multimeter, short meter test leads together. The
meter will display a small resistance value (usually 0.5
ohms or less). This internal resistance of the meter and
test leads should be subtracted from the measured val-
ue of the component.
CAUTION
Make sure sending unit is completely dry (no fuel
on it) before testing. Perform test away from the
tank to prevent an explosion or fire from sparks.
6. Check resistance of the sender with a multimeter
(Fig. 45).
A. Resistance with the float in the full position should
be 27.5 to 39.5 ohms.
B. Resistance with the float in the empty position
should be 240 to 260 ohms.
Electrical System
7. Replace sender as necessary. Reinstall sender into
fuel tank.
8. Connect wires to fuel sender. Apply skin--over
grease (see Special Tools in this chapter) to sender ter-
minals.
1. Fuel sender
2. White (+) lead
FULL POSITION
EMPTY POSITION
Page 5 - - 36
3
2
1
Figure 44
3. Black (- -) lead
Figure 45
Groundsmaster 4100--D/4110--D