Fuel Filter; Fuel Rail; Fuel Line - Kohler COMMAND CH18 Service Manual

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.
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

Fuel Rail
Locking Clip
Figure 5B-33. Manifold Assembly.
5B.22
TPS
Fuel
Injector
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-34. High Pressure Fuel Line.
General
Special low permeation high-pressure fuel line with
an SAE30 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. 25 111 37-S (containing
60" 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. Oetiker Clamp Pliers (part of EFI Service
Kit, see Section 2) is used to crimp the replacement
clamps.