Evap System; Evap System Overview - Polaris RZR XP 1000 2017 Service Manual

EVAP SYSTEM

EVAP SYSTEM OVERVIEW

An evaporative emission control system is a system that captures fuel tank vapors that would otherwise be vented to
the atmosphere. The EVAP system components consist of:
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Charcoal Canister: The charcoal canister is mounted near the fuel tank. Fuel vapors from the tank are routed to
and adsorbed by the canister's charcoal granules. When the vehicle is running, vapors are drawn into the engine by
intake vacuum. The purge valve controls the movement of the vapors from the canister to the throttle body.
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Purge Valve: The purge valve is located near the throttle body and is controlled by the ECU. There are two hose
assemblies that connect the two purge ports to the expansion chamber. Each hose assembly has a check valve.
The check valve controls the flow of vapor so that it can only flow in one direction, toward the throttle bodies. The
purge valve must be installed with the arrow pointing rearward (the direction the air flows toward the engine during a
purge event).
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Fuel Cap: On EVAP equipped vehicles, the fuel cap will have a ratcheting style fuel cap with a tether. It is
important to note that Polaris does not use an enhanced EVAP control system. This means the system does not
detect a gross leak, or restrictions in the EVAP system such as a missing or loose fuel cap. No check engine light will
illuminate.
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Fuel Tank: The fuel tank has a built in rollover valve to prevent liquid fuel from entering the EVAP system in case
of an incident such as the vehicle being upside-down.
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Air Filter and Lines: Before incoming air can enter the charcoal canister, it needs to be filtered. This air filter is
located near the fuel tank. The vent line for the air filter is connected to a plastic fitting. The fitting is pressed into the
frame tube in the left rear fender well. It is important to note that the air filter is directional. If replacement is required,
be sure to follow the directional markings on the filter. The arrow marking on the air filter must point in the direction of
air flow during a purge event. There are two additional markings on the air filter: CAN (canister) and ATM
(atmosphere). The CAN side of the filter is closest to the charcoal canister, and the ATM side is the end where air
enters first. If the air filter becomes plugged or restricted, fuel vapors will not properly flow through the air filter to the
charcoal canister and purge valve. The EVAP lines are multi-layer formed lines that have low permeability. If a line
needs replacement, be sure to replace the line with its direct replacement. It is critical that all lines follow their
original routing and fastening points when replaced.
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Expansion Chamber: The expansion chamber equipped on some EVAP vehicles, helps smooth out purged
vapor/air mixture coming from the charcoal canister via the purge valve.
9928492 R04 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual
© Copyright Polaris Industries Inc.
FUEL SYSTEM
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