Arctic Cat Cougar Service Manual page 260

250
be damaged by the cleaner are removed
before using a harsh cleaner.
1. If necessary, the fuel inlet fitting (7, Figure
27) can be unbolted and separated from the fuel
rail for cleaning.
2. The fuel pressure regulator (2, Figure 27) can
be unbolted and separated from the fuel rail. The
regulator assembly is available for service only
as a unit. Do not attempt to disassemble this unit.
NOTE
The ECU chip and each of the injector
nozzles must be properly matched. A red,
yellow or blue paint spot should be on
the ECU chip, the ECU housing and
each of the injector units. When ordering
replacement parts, be sure you know the
color code of the components.
If
you
have questions about correct applica-
tion, see your Arctic Cat dealer.
3. The fuel injectors (3, Figure 27) are available
separately. Observe the following:
a. Do not clean the red, yellow or blue color
code spot from the injector nozzle.
b. Do not attempt to disassemble or alter the
injector assemblies.
c. If a new injector is installed, make sure the
color code of the replacement unit matches
the code of the ECU chip in the ECU hous-
ing.
4. Make sure that seals are new or in good
condition and coated with oil when assembling
the fuel delivery assembly.
Fuel Rail, Pressure Regulator and Injectors
(EFI System not Powered by a Battery)
The fuel pump supplies pressurized fuel to the
end of the fuel rail. The pressure regulator assem-
bly, located at the right end of the fuel rail,
controls the pressure of the fuel in the fuel rail.
Fuel released by the pressure regulator is re-
turned to the fuel tank through the hose connec-
tion attached to the regulator. The injectors are
held in the bores of the fuel rail by the retainer
CHAPTER SEVEN
(Figure 28). The fuel rail is attached to the
throttle body with screws (Figure 29).
NOTE
It should not be necessary to separate
the fuel rail from the throttle body assem-
bly.
1. Loosen the clamp on the fuel delivery hose,
then pull the hose from the inlet fitting located
on the left end of the fuel rail.
2. Detach the electrical connector from the fuel
injector.
3. Remove the two screws (Figure 28) attaching
the retainer to the fuel rail.
4. Pull the injector straight up out of its bore in
the fuel rail.
5. Inspect the condition of the 0-rings andre-
place as necessary.