Fuel Pressure Regulator - Arctic Cat 2014 SNO PRO 500 Operator's Manual

4. The pump should operate (it would be heard run-
ning).
NOTE: If the fuel pump fails to operate, the pump
is defective and must be replaced.

Fuel Pressure Regulator

1. Using the EFI Fuel Pressure Test Kit (p/n 0644-
571), connect the tester to the delivery pipe and
gasline hose.
WARNING
Since the fuel supply hose may be under pressure, remove
it slowly to release the pressure. Place an absorbent
towel around the connection to absorb gasoline; then
remove the hose slowly to release the pressure. Always
wear safety glasses when removing the fuel hoses.
NOTE: A short piece of 3/8 in. I.D. hose will be
needed for this procedure.
2. Pressurize the regulator to 2.0-2.2 kg/cm² (28-31.3
psi). Turn the pressure tester shut off valve to the
OFF position. Observe the gauge for several min-
utes and note any loss of pressure. If pressure
begins to drop, the cause may be a ruptured dia-
phragm, worn spring, or leaking valve. If the regu-
lator fails to build or maintain pressure, the fuel
pump assembly must be replaced.
NOTE: If the pressure drops, check the hose con-
nections to ensure no leaks exist.
Testing Coolant Temperature
Sensor Resistance
NOTE: The coolant temperature sensor is very
sensitive to temperature change. Before the resis-
tance test is conducted, the coolant temperature
must be known. If the engine has been operated
recently and the coolant is warm, the resistance
will measure lower than if the coolant was at room
temperature or colder. For accurate test results,
check the coolant temperature in the filler neck
using a thermometer.
1. Disconnect the coolant temperature sensor wiring
harness from the main harness.
56
2. Set the meter selector to the OHMS position and
test the resistance between the two leads from the
sensor.
3. Compare the resistance reading to the Voltage/
Resistance Chart - Coolant Temperature in this
manual. If resistance is not within the specifica-
tion, replace the sensor.
NOTE: A coolant temperature sensor voltage test
can be made using the EFI Analyzer.
NOTE: The coolant temperature sensor is located
at the lower half of the crankcase. To remove the
sensor, the engine must be removed.
Testing Air Temperature Sensor
Resistance
NOTE: The component temperature must be
known before conducting this test. Allow the
engine to reach room temperature.
1. Disconnect the wiring harness from the air temper-
ature sensor.
AO053
2. Set the meter selector in the OHMS position and
test the two leads located in the sensor connector.
Compare with the Voltage/Resistance Chart - Air
Temperature in this manual.
NOTE: The air temperature sensor utilizes a therm-
istor, which is very sensitive to temperature changes.
Resistance will change as temperature varies.
Removing Air Temperature Sensor
1. Disconnect the wiring harness from the air temper-
ature sensor.
2. Using a standard screwdriver, pry the sensor end
to end to remove it from the air silencer. Account
for two push pins.
Installing Air Temperature Sensor
1. Place the sensor into position in the air silencer
and secure with push pins.
2. Connect the wiring harness to the air temperature
sensor. Secure the sensor leads with cable ties so
they do not rub on any other components.
AO135D