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5B.21
Section 5B
EFI Fuel System
5B
Fuel Rail
6. Install the new regulator by carefully pushing
and rotating it slightly into the base or housing.
a. 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.
b. Secure the regulator in the 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 and connect any parts removed in
step 3.
8. Reconnect the negative (-) battery cable.
9. Recheck regulated system pressure at fuel rail test
valve.
Fuel Filter
EFI engines use a high-volume, high-pressure, 10-15
micron, in-line fuel filter.
Figure 5B-29. In-Line Fuel Filter.
Service
Filter replacement is recommended every 1500 hours
of operation or more frequently under extremely
dusty or dirty conditions. Use only the specified filter,
and install it according to the directional arrows. Do
not use a substitute filter as operating performance
and safety can be affected. Relieve system pressure
through the safety valve in the fuel rail before
servicing.
Figure 5B-30. Throttle Body/Intake Manifold.
General
The fuel rail is a formed tube assembly that feeds fuel
to the top of the injectors. The tops of the injectors fit
into formed cups in the fuel rail. When the rail is
fastened to the manifold, the injectors are locked into
place. A small retaining clip provides a secondary
lock. Incorporated into the fuel rail is a pressure relief/
test valve for testing operating pressure or relieving
fuel system pressure for servicing. The fuel supply
line is attached to the barbed end of the fuel rail with
an Oetiker hose clamp.
Service
The fuel rail is mounted to the throttle body/intake
manifold. No specific servicing is required unless
operating conditions indicate that it needs internal
cleaning or replacement. It can be detached by
removing the two mounting screws and the injector
retaining clips. Thoroughly clean the area around all
joints and relieve any pressure before starting any
disassembly.
Fuel Line
Locking Cups
Fuel Rail
TPS
Fuel Injector
Figure 5B-31. High Pressure Fuel Line.