3.13
Maintenance
3
Fuel Tank Vent System
All models feature a fuel tank vent / vacuum check valve system.
There are two systems used depending on the model year of the
snowmobile.
On some models, the vent / vacuum check valve system
resembles the illustration below.
When inspecting the system, verify the hoses are not cut or
kinked.
Some models feature a rollover check valve / vent / vacuum
check valve assembly bonded to the inside of the fuel tank. The
rollover check valve prevents fuel from escaping the tank in the
event of a vehicle rollover.
The rollover check valve is not serviceable. When inspecting the
system, verify the hose is not kinked.
Air Intake Box / Pre-Filters
Inspect the inside of the air intake box and pre-filters for foreign
material and/or damage.
NOTE: All 2007 and some 2008 CFI models were
manufactured with a two-piece airbox where an
adapter plate was secured to the throttle body. The
airbox then snapped into the adapter plate to make
the airbox assembly.
The two-piece air box is no longer available. A one-
piece air box is the direct replacement. The new air
box features adaptor boots that are pinned to the air
box. A set of gear clamps secure the boots to the
throttle body assembly.
Inspect the console-mounted pre-filters for damage, and foreign
material. Replace filter(s) or clean if required.
VENT CHECK VALVE
VACUUM CHECK VALVE
(“VAC” FACES “Y” FITTING)
(ARROW POINTS AWAY FROM TANK)
ROLLOVER VALVE
ONE-PIECE CFI AIR BOX
PRESS./TEMP. SENSOR
ADAPTOR
BOOTS
PINS
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