Filter
Top Products
5B.21
Section 5B
EFI Fuel System
5B
Figure 5B-29. 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 -
Based upon the style of regulator used: See
Figure 5B-30.
a. Remove the two screws securing the
mounting bracket to the regulator housing.
Remove the O-Ring and pull the regulator out
of the housing.
b. Remove the snap ring and remove regulator
from base/holder.
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-31.
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-31. 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 (external regulator) with
light grease or oil.
6. a. Install the new regulator by carefully pushing
and rotating it slightly into the base or housing.
b. External Regulators with Square Base
Housing Only; Install a new O-Ring between
the regulator and the mounting bracket. Set
the mounting bracket into position.
c. Secure the regulator in base with the original
retaining ring or screws. Be careful not to dent
or damage the body of the regulator as
operating performance can be affected.
7. Reassemble any parts removed in step 3.
Figure 5B-30. External Regulators and Base/
Holders.