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5.1
Section 5
Fuel System and Governor
5
Section 5
Fuel System and Governor
Description
The Command horizontal twins use three different
types of fuel systems; carbureted, electronic fuel
injection (EFI), or gaseous. Gaseous fuel systems can
be either liquefied petroleum gas (LPG or LP) or
natural gas (NG). Some dual-fuel engines have a
combination system, which allows the operator to
select either gasoline or LP.
This section covers the standard carbureted fuel
systems. The gaseous systems are covered in
subsection 5A and the EFI systems are covered in
subsection 5B. The governor systems used are
covered at the end of this section.
WARNING: Explosive Fuel!
Gasoline is extremely flammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or flames. Do not fill 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
• Fuel Lines
• In-line Fuel Filter
• Fuel Pump
• Carburetor
Operation
The fuel from the tank is moved through the in-line
filter 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 float 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.
Fuel Recommendations
General Recommendations
Purchase gasoline in small quantities and store in
clean, approved containers. A container with a capacity
of 2 gallons or less with a pouring spout is
recommended. Such a container is easier to handle
and helps eliminate spillage during refueling.
• Do not use gasoline left over from the previous
season, to minimize gum deposits in your fuel
system and to ensure easy starting.
• Do not add oil to the gasoline.
• Do not overfill 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 or
higher. In countries using the Research fuel rating
method, it should be 90 octane minimum.
Unleaded gasoline is recommended as it leaves less
combustion chamber deposits and reduces harmful
exhaust emissions. 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 are not
approved.
CH18-745