Kohler COMMAND CH18-745 User Manual download pdf (Page 80)

5B.21

Section 5B

EFI Fuel System

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.

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Kohler COMMAND CH18-745 User Manual Page 80

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