User Manual

26
KohlerEngines.com 24 690 01 Rev. D
High pressure fuel line is serviced as a complete
assembly to prevent tampering and safety hazards.
Components are not individually serviceable.
Vent hose assembly is intended to vent fuel vapor out of
fuel pump module and direct fuel vapor into throttle body.
All EFI engines are equipped with an engine mounted
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purge port can be used by OEM to vent fuel tanks or
used in conjunction with a carbon canister kit for Tier III
evaporative emissions compliance. Purge port connects
to vent hose assembly and directs all fuel vapor into
throttle body. If purge port remains unused, port must
remain capped to prevent dirt from entering engine.
EFI engines have no carburetor, so throttle function
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a throttle valve in a separate throttle body attached to
intake manifold. Throttle body/intake manifold provides
mounting for fuel injectors, throttle position sensor, MAP
sensor, intake air temperature sensor, high pressure fuel
line, idle speed screw, and air cleaner assembly.
Idle speed is only adjustment that may be performed on
EFI system. Standard idle speed setting for EFI engines
is 1500 RPM, but certain applications might require
a different setting. Check equipment manufacturer’s
recommendation.
For starting and warm up, ECU will adjust fuel and
ignition timing, based upon ambient temperature, engine
temperature, and loads present. In cold conditions,
idle speed will probably be different than normal for a
few moments. Under other conditions, idle speed may
actually start lower than normal, but gradually increase
to established setting as operation continues. Do not
attempt to circumvent this warm up period, or readjust
idle speed during this time. Engine must be completely
warmed up, in closed loop operating mode for accurate
idle adjustment.
IMPORTANT NOTES!
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times when servicing or working on EFI system. Dirt,
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problems.
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before opening to prevent dirt from entering system.
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connector on fuel pump module before disconnecting
or servicing any fuel system components.
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while engine is running or ignition switch is ON.
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any parts removed and wrap any open joints with
plastic if they will remain open for any length of time.
New parts should be removed from their protective
packaging just prior to installation.
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components.
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connector or any individual components with ignition
on. This can send a damaging voltage spike through
ECU.
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terminals. When connecting battery cables attach
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followed by negative () cable to negative () battery
terminal.
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connected to battery terminals.
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charging battery, and also unplug harness from ECU
before performing any welding on equipment.
DELPHI EFI