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5B.22
Section 5B
EFI Fuel System
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.
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. It can be detached by removing the two
mounting screws and the injector retaining clips.
Thoroughly clean the area around all joints prior to any
disassembly. No specific servicing is required unless
operating conditions indicate that it needs internal
cleaning or replacement.
Fuel Line
Figure 5B-32. In-Line Fuel Filter.
Service
Fuel 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.
Fuel Rail
Figure 5B-34. High Pressure Fuel Line.
General
High-pressure fuel line with an SAE R9 rating is
required for safe and reliable operation, due to the
higher operating pressure of the EFI system. If hose
replacement is necessary, order Fuel Line Service Kit,
Part No. 24 353 42-S (containing 5 ft. of high-pressure
hose and 10 Oetiker clamps), or use only the type
specified. Special Oetiker clamps (Kohler Part No.
24 237 05-S) are used on all fuel line connections to
prevent tampering and safety hazards with the high
fuel pressure. The old clamp must be cut to open a
connection, so replacement is necessary each time.
Pliers (SPX Part No. KO3217-5) is used to crimp the
replacement clamps.
TPS
Fuel
Injector
Locking Clip
Fuel Rail
Figure 5B-33. Manifold Assembly.