Fuel System - Fuel Injected Models; Chapter Seven - Arctic Cat Cougar Service Manual

Chapter Seven
Fuel System-Fuel Injected Models
For optimum performance, a gasoline engine
must be supplied with fuel and air mixed in
proper proportions. A mixture in which there is
too much fuel is said to be rich. A lean mixture
has insufficient fuel for efficient combustion.
A fuel system operating correctly and prop-
erly adjusted will supply the proper mixture of
air and fuel at various engine speeds and under
a wide range of operating conditions.
Electronic Fuel Injection (EFI) has been used
on some 1994 and later models. On all models
prior to 1997, the EFI system uses a battery to
power the system. In 1997 an EFI system was
introduced similar to earlier models, but it does
not require a battery. Both EFI systems have been
used on 1997 and 1998 models.
NOTE
The type of fuel injection system-mag-
neto-powered or battery-powered-can
be identified by the color and location of
the ECU box. On battery-powered sys-
tems the ECU is mounted next to the
chaincase and the box is shiny. On bat-
teryless systems the ECU is mounted on
the airbox and the box is black.
The fuel injection system consists of the fol-
lowing subsystems: air flow system, fuel flow
system, electronic control system and electrical
system. This chapter includes service procedures
for all parts of the fuel system. Specifications are
listed in Tables 1-4 at the end of the chapter.
WARNING
Gasoline is highly flammable. Always
exercise extreme care when working
around gasoline. Work in a well-venti-
lated area, away from any flame, sparks
or other possible ignition source. Pre-
vent spills by being prepared to plug any