Fuel Sender - Toro Groundsmaster 300 Series Service Manual

Fuel Sender

The fuel sender is located on top of the fuel tank.
Testing
1. Remove blue wire and black ground wire from the
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.
2. To test the circuit wiring and fuel gauge, connect blue
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 acceptable.
3. Remove five (5) screws that secure the sender to the
fuel tank.
4. 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. This internal
resistance of the meter and test leads should be sub-
tracted from the measured value 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.
5. Check resistance of the sender with a multimeter
(Fig. 6).
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.
6. Replace sender as necessary. Reinstall sender into
fuel tank.
7. Reconnect wires to fuel sender. Apply skin–over
grease (Toro Part No. 505–47) to sender terminals.
Electrical System (Rev. G)
Page 6A – 6
FULL POSITION
EMPTY POSITION
Figure 6
Groundsmaster 300 Series