RZT-S
10
Evaporative (EVAP) emissions system
The EPA has enacted rules that regulate the amount of vapors an engine’s fuel system is allowed to vent to the
atmosphere. The rules are know as tier III emissions guidelines. These rules apply to all engines built on or after 1/1/
2012. Some of the requirements of tier III emissions include:
• Tethered fuel caps.
• Unvented fuel caps.
• Low permeation (GREENbar
TM
) fuel line
• Roll over valve vents
The fuel tank has an unvented fuel cap. The fuel tank
vents through the roll over valve. The vapors will flow
through the vent hose (black hose with a red trace) to the
engine. See Figure 2.11.
The EVAP system, from the fuel tank up to the engine
connector, is a Cub Cadet system, meaning warranty and
parts are handled by Cub Cadet.
The engine side of the system varies by engine manu-
facturer, but on most engines the vent hose will go to the
air intake manifold.
NOTE: Units sold in California will have a charcoal
canister to further reduce the amount of
emissions that escape from the fuel system.
The fuel tank will vent through the charcoal
canister. The charcoal in the canister will act
as a filter and remove some of the vapors
that are venting out of the fuel tank.
A second vent hose connects the canister to
the engine. As the engine runs, the vacuum
in the intake manifold will draw the vapors
out of the charcoal, recharging it.
See Figure 2.12.
NOTE: A leak in the vent hose will allow dirt injec-
tion in the engine. This will not affect engine
performance until the dirt ingestion has
cause damage inside the engine.
Figure 2.11
Fuel tank
Fuel pick up tube
Fuel cap
Roll over valve
49 state fuel system
%NGINE
#HARCOAL
CANISTER
6ENT
Figure 2.12
California fuel system
www.mymowerparts.com
For Discount Cub Cadet Parts Call 606-678-9623 or 606-561-4983
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