Kohler PRO 12.3 EFI Owner's Manual page 8

Visually check level of fuel. If necessary, fill up.
1. Unscrew fuel tank cap (O).
2. Fill fuel tank using a funnel, taking care not to
spill any fuel. Do not overfill tank (there
should not be any fuel in filler neck).
3. Screw fuel tank cap (O) back on.
Fuel Filter
1. Open fuel tank cap (O).
2. Remove fuel filter (Q) from tank neck.
3. Clean fuel filter (Q) with a non-flammable
solvent or solvent with a high flash point. Dry
it fully. Replace as necessary.
4. Reinstall fuel filter (Q).
5. Reinstall fuel tank cap (O).
Electronic Fuel Injection (EFI) System
EFI is an electronically-controlled fuel
management system which is monitored by an
Electronic Control Unit (ECU). A Malfunction
Indicator Light (MIL) will illuminate if problems
or faults are detected. Servicing by a Kohler
portable dealer is necessary.
Fuel Line
High pressure fuel line meeting SAE R9
standard must be installed on Kohler Co.
engines equipped with an EFI system.
Fuel System Components
High pressure components inside fuel pump
module (W) are not serviceable. Engines are
equipped with a special EFI fuel filter (AH). See
Maintenance Schedule.`
Spark Plugs
Electrical Shock can cause injury.
Do not touch wires while
generator is running.
Never operate generator in rain or snow.
Never touch generator with wet hands or
electrical shock may occur.
Clean out spark plug recess. Remove plug and
replace.
1. Check gap using wire feeler gauge. Adjust
gap, see specification table for adjustment.
2. Install plug into cylinder head.
3. Torque spark plug (X) to 20 ft. lb. (27 N·m).
8
CAUTION
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Engine Fuse Replacement
This engine has three (3) blade type automotive
fuses (R). Replacement fuses (R) must have
same rating as blown fuse. Use fuse chart
below to determine correct fuse (R).
Wire Color
2 Solid Red Wires
1 Red Wire with Black Stripe
1 Red Wire with White Stripe
2 Purple Wires
Air Cleaner
NOTE: Operating engine with loose or
damaged air cleaner components
could cause premature wear and
failure. Replace all bent or damaged
components.
NOTE: Paper element (AA) cannot be blown
out with compressed air.
Loosen knob (AF) and remove air cleaner cover
(AG).
Precleaner (AB):
1. Remove precleaner (AB) from paper element
(AA).
2. Replace or wash precleaner (AB) in warm
water with detergent. Rinse and allow to air
dry.
3. Saturate precleaner (AB) with new engine oil;
squeeze out excess oil.
4. Reinstall precleaner (AB) over paper element
(AA).
Paper Element (AA):
1. Clean area around element (AA). Remove
wing nut (AE), element cover (AD), and
paper element (AA) with precleaner (AB).
2. Separate precleaner (AB) from element (AA);
service precleaner (AB) and replace paper
element (AA).
3. Check condition of rubber seal (AC) and
replace if necessary.
4. Install new paper element (AA) on base (Z);
install precleaner (AB) over paper element
(AA); reinstall element cover (AD) and
secure with wing nut (AE).
Reinstall air cleaner cover (AG) and secure with
knob (AF).
Breather Tube
Ensure both ends of breather tube are properly
connected.
Fuse Rating
10-amp Fuse
10-amp Fuse
30-amp Fuse
34 590 01 Rev. A