Troubleshooting - Arctic Cat Sno Pro 120 Service Manual

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.
3. Connect Fuel Pressure Test Kit to the fuel pump and
fuel hose.
4. On the 500, start the engine. On the 1100 cc, turn the
ignition key to the ON position.
should be as specified.
500 cc
1100 cc Non-Turbo
1100 cc Turbo
 NOTE: If fuel pressure is not as specified, the pump
is defective and must be replaced.
5. Disconnect the fuel pump from the main wiring harness.
6. Connect the positive lead of a 12-volt power supply
to the red wire and the negative lead of the 12-volt
power supply to the black wire.
7. The pump should operate (it would be heard running).
 NOTE: If the fuel pump fails to operate, reverse the
power supply at the fuel pump connector allowing the
motor to run in the opposite direction. This will verify
that nothing has entered and/or obstructed the pump.

Troubleshooting

Problem: Too Rich
Condition
1. Diagnostic trouble code activated
2. Fuel pressure too high
3. Fuel return hose obstructed
4. Injectors leaking
Problem: Too Lean
Condition
1. Diagnostic trouble code activated
2. Fuel pressure too low
3. Vent hose obstructed
4. Fuel filter(s) obstructed
4-26
PC031A
Fuel pressure
42.8-47.3 psi
43.5 psi
36.0 psi - Idle
55.0 psi - Full Boost
 NOTE: If the fuel pump still fails to operate, the
pump is defective and must be replaced.
REMOVING
1. Using a gasline hose equipped with a one-way check
valve, drain the gas from the gas tank; then remove
the gas tank (see Gas Tank in this section).
2. Disconnect the fuel pump harness connector.
3. Remove the six self-tapping screws securing the
retaining plate; then remove the fuel pump noting the
orientation of the fuel pump outlet for installing pur-
poses. Account for the seal.
4. Remove and discard the hose clamp securing the
gasline hose to the fuel pump inlet.
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: If the fuel pickup assembly is not being
replaced, inspect the screens for any tears or
obstructions. Also check the gasline hoses and
replace if necessary.
INSTALLING
1. Install a new seal on the fuel pump; then with a new
hose clamp, secure the gasline hose with the pickup
assembly to the inlet of the fuel pump.
2. Install the fuel pump and pickups into the gas tank
and position the fuel pump so the outlet is properly
oriented (as noted during removing).
3. Install the retaining plate and secure to the gas tank
with the six self-tapping screws. Tighten to 40 in.-lb.
CAUTION
Use care not to over tighten the retaining plate screws
or damage to the gas tank may result.
4. Install the gas tank (see Gas Tank in this section);
then connect the fuel pump harness connector.
Remedy
1. Replace problem sensor
2. Replace regulator
3. Service - replace hose - remove obstruction
4. Replace injectors
Remedy
1. Replace problem sensor
2. Replace regulator/fuel pump
3. Remove obstruction
4. Replace fuel filter(s)