42
EFI System
KohlerEngines.com
66 690 14 Rev. A
Fuel Pressure Regulator
Fuel Pressure Regulator Details
B
A
C
I
D
E
F
H
G
A
Pressure Regulating
Spring
B
Pressure Regulating
Chamber
C
Diaphragm
D
Valve Seat
E
Fuel Chamber
F
Outlet Port
(to fuel rail)
G
Return Port (to tank)
H
Inlet Port
I
Valve
Regulator is a sealed, non-serviceable assembly. If it is
faulty, it must be replaced as follows:
1. Shut engine o
ff
, make sure engine is cool, and
disconnect negative (–) battery cable.
2. Depressurize fuel system through fuel connector.
3. Access regulator assembly as required and clean
any dirt or foreign material away from area.
4. Disconnect all fuel hoses from regulator. Remove
screws securing regulator assembly.
5. Install new regulator and reconnect hoses (using
new clamps).
6. Reconnect negative (–) battery cable.
7. Recheck regulated system pressure.
Fuel Rail
Fuel rail is mounted to throttle body/intake manifold. No
speci
fi
c servicing is required unless operating conditions
indicate that it needs internal cleaning or replacement.
It can be detached by removing mounting screws and
injector retaining clips. Thoroughly clean area around
all joints and relieve any pressure before starting any
disassembly.
Purge Port and Vent Hose Assembly
No speci
fi
c servicing is required for vent hose assembly
or purge port unless operating conditions indicate
replacement is required. All components are serviced
individually. Abrasion sleeves on hoses should be
reused or replaced when servicing vent hoses. Please
note vent hose routing and replicate after service or
component replacement to prevent pinching or abrasion
of vent hoses. Only Kohler replacement parts can be
used because
fi
tting is speci
fi
c to system and must be
maintained. Visit KohlerEngines.com for recommended
Kohler replacement parts.
Throttle Body/Intake Manifold Assembly
Throttle body/intake manifold is serviced as an
assembly, with throttle shaft, TPS, throttle plates, and
idle speed adjusting screw installed.
