11.1
Section 11
Emission Compliance Systems
11
Section 11
Emission Compliance Systems
Evaporative Emission Compliance System
For the engine to be Tier III compliant, it may be fied with a Kohler-supplied canister vapor recovery system, or a
system developed and installed by the Original Equipment Manufacturer (OEM). Details on the Kohler system are
included below.
Operation: Fuel vapors travel from the fuel tank through tubing to the carbon canister. On the intake stroke of the
engine fuel vapors are drawn in through a port in the carburetor and burned with the fuel charge. See Figure 11-1.
Maintenance: On Kohler-supplied canisters, the breather filter can be removed and cleaned with hot soapy water,
dried and reinstalled. Do not oil the breather screen. This is done periodically or if system operation is suspect. The
carbon canister is sealed and requires no maintenance. See Figure 11-1.
In some applications or installations, the OEM will have installed a different canister or fuel vapor recovery system.
See the OEM equipment documentation for service or maintenance information.
Fuel Tank
Roll Over
Valve (ROV)
Carbon Canister
Canister
Breather
Filter
To Carburetor
Figure 11-1. Carbon Canister System Diagram.
Fuel Tank Cap
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