Kohler Command PRO ECH749 Service Manual

5.22
Section 5
EFI Fuel System
Figure 5-20. High Pressure Fuel Line with Fuel
Injectors.
General
The high pressure fuel line is an assembly of hoses,
injector caps and a fuel connector to the fuel pump
module. The high pressure fuel line feeds fuel to the
top of the injectors through the injector caps. The caps
are fastened to the intake manifold and the injectors
are locked into place. A small retaining clip provides a
secondary lock.
The high pressure fuel line is serviced as a complete
assembly to prevent tampering and safety hazards.
The components are not individually serviceable.
These engines use low permeation rated fuel lines,
certiedtocomplywithCaliforniaandU.S.EPA
evaporative emission requirements. Fuel lines that do
not meet these requirements may not be used. Order
replacement hose through a Kohler Service Center.
CAUTION:
Low permeation high-pressure fuel line with an SAE 30R9
or 30R12 rating (1/4 in. I.D.) is required for safe and
reliable operation due to higher operating pressure of the
EFI system. Low permeation low-pressure fuel line with a
SAE 30R7 rating (1/4 in. I.D.) may only be used between
the fuel tank and li pump, between the li pump and fuel
pump module, or as otherwise congured in the application.
6. If voltage is between 7 and 14, turn key switch
OFF and connect an ohmmeter between the
terminals on the pump to check for continuity.
a. If there was no continuity between the pump
terminals, replace the fuel pump.
b. If the voltage was below 7, test the wiring
harness.
7. If voltage at the plug was good, and there was
continuity across the pump terminals, reconnect
the plug to the pump, making sure you have a
good connection. Turn on the key switch and
listen for the pump to activate.
a. If the pump starts, repeat steps 2 and 3 to
verify correct pressure.
b. If the pump still does not operate, replace it.
NOTE: The fuel pump module pins are coated with
a thin layer of electrical grease to prevent
freingandcorrosion.Donotaemptto
remove electrical grease from the fuel pump
module pins.
Fuel Filter
Figure 5-19. In-Line Fuel Filter.
General
The precision components inside the fuel pump
modulearenotserviceable.DONOTaempttoopen
the fuel pump module. Damage to the components
will result and the warranty will be void. Because
the fuel pump module is not serviceable, the engines
areequippedwithaspecial10-micronEFIfuellter
to prevent harmful contamination from entering the
module. See Figure 5-19.
Iftherearetwoltersinthesystem,theonebefore
thelipumpwillbeastandard51-75micronlter,
andtheoneaerthelipumpwillbethespecial
10-micronlter.Besuretouseanapproved10-micron
lterforreplacement.
Service
Periodicallyinspectthelterandreplaceevery 200
operating hours or more frequently under extremely
dusty or dirty conditions. Use only a genuine Kohler
lterandinstallitaccordingtothedirectionalarrows.
Failuretousetheproperltercanresultinengine
damage and void the warranty.
High Pressure Fuel Line

Kohler Command PRO ECH749 Specifications

General

Fuel System	Carburetor
Starter	Electric
Governor Type	Mechanical
Lubrication System	Full Pressure
Fuel Type	Gasoline
Crankshaft Orientation	Horizontal
Bore	3.27 in (83 mm)
Cooling System	Air
Oil Type	SAE 10W-30
Spark Plug Gap	0.030 in (0.76 mm)
Valve Clearance - Intake	0.004 - 0.006 in (0.10 - 0.15 mm)
Crankshaft Type	Varies by model
Crankshaft Thread Size	Varies by model
Crankshaft Length	Varies by model
Crankshaft Diameter	Varies by model
Type	Overhead Valve (OHV)