Section 5. Fuel System And Governor - Kohler Comand Pro CH1000 Service Manual

Fuel System and Governor
Description
This section covers the standard carbureted fuel
system used on these engines. The governor system
used is covered at the end of this section.
WARNING: Explosive Fuel!
Gasoline is extremely fl ammable and its vapors can explode
if ignited. Store gasoline only in approved containers, in
well ventilated, unoccupied buildings, away from sparks or
fl ames. Do not fi ll the fuel tank while the engine is hot or
running, since spilled fuel could ignite if it comes in contact
with hot parts or sparks from ignition. Do not start the
engine near spilled fuel. Never use gasoline as a cleaning
agent.
Fuel System Components
The typical carbureted fuel system and related
components include the following:
• Fuel Tank and Valve
• Fuel Lines
• In-line Fuel Filter
• Fuel Pump
• Carburetor
Operation
The fuel from the tank is moved through the in-line
fi lter and fuel lines by the fuel pump. On engines not
equipped with a fuel pump, the fuel tank outlet is
located above the carburetor inlet allowing gravity to
feed fuel to the carburetor.
Fuel then enters the carburetor fl oat bowl and is
drawn into the carburetor body. There, the fuel is
mixed with air. This fuel-air mixture is then burned in
the engine combustion chamber.
Section 5
Fuel Recommendations
General Recommendations
Purchase gasoline in small quantities that can be used
within 30 days and store only in clean, approved
containers. Do not use gasoline left over from the
previous season, unless treated with a fuel stabilizer
(see Storage in Section 1), to minimize gum deposits
and ensure easy starting. Do not use gasoline
containing Methanol, or add oil to the gasoline.
Do not overfi ll the fuel tank. Leave room for the fuel
to expand.
Fuel Type
For best results use only clean, fresh, unleaded
gasoline with a pump sticker octane rating of 87
(R+M)/2 or higher. In countries using the Research
Octane Number (RON), it should be 90 octane
minimum. Leaded gasoline is not recommended and
must not be used on EFI engines or on other models
where exhaust emissions are regulated.
Gasoline/Alcohol blends
Gasohol (up to 10% ethyl alcohol, 90% unleaded
gasoline by volume) is approved as a fuel for Kohler
engines. Other gasoline/alcohol blends including E20
and E85 are not to be used and not approved. Any
failures resulting from use of these fuels will not be
warranted.
Gasoline/Ether blend
Methyl Tertiary Butyl Ether (MTBE) and unleaded
gasoline blends (up to a maximum of 15% MTBE by
volume) are approved as a fuel for Kohler engines.
Other gasoline/ether blends are not approved.
Fuel Filter
Most engines are equipped with an in-line fuel
fi lter. Periodically inspect the fi lter and replace with
a genuine Kohler fi lter seasonally or every 150
operating hours.
Fuel System and Governor
Section 5
5
5.1