5B.18
Section 5B
EFI Fuel System
Figure 5B-24. Internal Regulator and Base/Holder.
5. Always use new O-Rings and hose clamps when
installing a regulator. A new replacement regulator
will have new O-Rings already installed. Lubricate
the O-Rings with light grease or oil.
6. Install the new regulator by carefully pushing and
rotating it slightly into the base or housing.
7. Secure with the retaining ring. Be careful not to
dent or damage the body of the regulator as
operating performance can be affected.
8. Reassemble any parts removed in step 3.
9. Reconnect the negative (-) battery cable.
10. Recheck the regulated system pressure at the fuel
rail test valve.
Outlet Port
(to fuel rail)
Return Port (to tank)
Inlet Port
Pressure
Regulating
Spring
Pressure
Regulating
Chamber
Diaphragm
Valve
Valve Seat
Fuel Chamber
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.
Figure 5B-23. External Regulator and Base/Holder.
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