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5B.2
Section 5B
EFI Fuel System
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.
The EFI fuel system remains under high pressure,
even when the engine is stopped. Before attempting to
service any part of the fuel system, the pressure must
be relieved. Pressure tester, SPX Part No. KO3217-4
has an integral relief valve. Connect the black tester
hose to the test valve in the fuel rail. Route the clear
hose into a portable gasoline container. Depress the
button on the tester relief valve.
Initial Starting/Priming Procedure
Important: The EFI fuel system must be purged of all
air prior to the initial start up, and/or any time the
system has been disassembled. On most engines,
that can be done similar to relieving fuel pressure, as
described above.
Test Valve in Fuel Rail:
1. Connect the pressure gauge as described above
for relieving fuel pressure. Depress and hold the
release button and crank the engine in 10-15
second intervals, allowing a 60 second cool-down
period between intervals, until air is purged and
fuel is visible in discharge tube.
2. If you do not have the pressure gauge, follow the
procedure for engines without a test valve.
Description
NO Test Valve in Fuel Rail:
1. Crank the engine in 10-15 second intervals,
allowing a 60 second cool-down period between
cranking intervals, until the engine starts.
NOTE: The number of cranking intervals necessary
will depend on the individual system design,
and/or where the system has been
disassembled.
Fuel Recommendations
General Recommendations
Purchase gasoline in small quantities and store in
clean, approved containers. An approved container
with a capacity of 2 gallons or less with a pouring spout
is recommended. Such a container is easier to handle
and helps prevent 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
Do not use leaded gasoline, as component damage
will result. Any costs/damages incurred as a result of
using leaded fuel will not be warranted. Use only clean,
fresh, unleaded gasoline with a pump sticker octane
rating of 87 or higher. In countries using the Research
method, it should be 90 octane minimum.
Gasoline/Alcohol blends
Gasohol (up to 10% ethyl alcohol, 90% unleaded
gasoline by volume) is approved as a fuel for Kohler
EFI engines. Other gasoline/alcohol blends are not
approved.
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 EFI engines.
Other gasoline/ether blends are not approved.
Explosive Fuel can cause fires and
severe burns.
Fuel system ALWAYS remains under
HIGH PRESSURE.
WARNING