Kohler Courage SV710-740 Service Manual page 33

This section covers the carbureted fuel systems used
on these engines. The governor system is covered at
the end of this section.
The typical carbureted fuel system and related
components include the following:
• Fuel Tank
• Fuel Lines
• In-line Fuel Filter
• Fuel Pump
• Carburetor
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.
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.
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.
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.
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.