5.1
Section 5
Fuel System and Governor
5
Section 5
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 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 and Valve
• 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 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 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 .
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 blends
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 filter.
Periodically inspect the filter and replace with a
genuine Kohler filter
seasonally
or
every 150
operating hours
.
Fuel Line
These engines use Low Permeation SAE 30 R7 rated
fuel line; certified to meet emission requirements.
Standard fuel line may not be used. Order
replacement hose by part number through a Kohler
Engine Service Dealer.
