Kohler LH630-775 Service Manual page 58

Section 5B
EFI Fuel System
Pressure
Regulating
Spring
Valve
Inlet Port
Return Port (to tank)
Figure 5B-22. Fuel Pressure Regulator Details.
Service
Depending on the application, the regulator may be
located in the fuel tank along with the fuel pump, or
outside the tank just down line from the pump. The
regulator is a sealed, non-serviceable assembly. If it is
faulty, it must be separated from the base/holder
assembly and replaced as follows.
1. Shut engine off, make sure engine is cool, and
disconnect the negative (-) battery cable.
2. Depressurize fuel system through test valve in
fuel rail (see fuel warning on page 5B.2).
3. Access the regulator assembly as required and
clean any dirt or foreign material away from the
area.
4. External Regulator
Remove the retaining ring securing the regulator
in the regulator housing. Pull the regulator out of
the housing. See Figure 5B-23.
Internal (In-Tank) Regulator
Remove the three screws securing the retaining
ring and regulator in the base/holder assembly.
Grasp and pull the regulator out of the base/
holder. See Figure 5B-24.
5B.18
Pressure
Regulating
Chamber
Diaphragm
Valve Seat
Fuel Chamber
Outlet Port
(to fuel rail)
Figure 5B-23. External Regulator and Base/Holder.
Figure 5B-24. Internal Regulator and Base/Holder.
5. Always use new O-Rings and hose clamps when
6. Install the new regulator by carefully pushing
7. Secure with the retaining ring. Be careful not to
8. Reassemble any parts removed in step 3.
9. Reconnect the negative (-) battery cable.
10. Recheck the regulated system pressure at the fuel
installing a regulator. A new replacement
regulator will have new O-Rings already
installed. Lubricate the O-Rings with light grease
or oil.
and rotating it slightly into the base or housing.
dent or damage the body of the regulator as
operating performance can be affected.
rail test valve.