GENERAL INFORMATION
TEC
ICAL FEATURE {AFTE '13 MOD
L)
FUEL PUMP SYSTEM WITH A FUEL FILTER BLOCKAGE REMINDER FUNCTION
FUEL PUMP
t········
PUMP CHAMBER
---····,,
$:EE
To FUEL INJECTOR
~
: Air suction passage under fuel filter blockage
~
I :
Air discharge passage under normal fuel filter condition
~
:
Fuel
flow under normal fuel filter condition
The fuel pump system of this model consists
of
the following components:
- Fuel pump chamber
- Fuel filter
Breather passage
- Breather filter
BREATHER FILTER
FUEL LEVEL
BREATHER
PASSAGE
Under normal conditions, the fuel pump chamber sucks fuel through the fuel filter and then supplies it to the injector.
When the fuel filter
is
clogged, the fuel is sucked into the pump chamber through the breather passage
in
order to keep the vehicle
running. The breather filter is located
in
the upper inner side of fuel tank. When the fuel
is
coi:,sumed to the point where the breather
filter is exposed above the fuel level, a certain amount of air will be drawn into the pump chamber via the breather filter and breather
passage. This incoming air produces "a lack of fuel", which impairs engine performance
in
order to notify the rider
of
the fuel filter
blockage. This symptom works as a reminder for the filter replacement.
This system eliminates the need
of
fuel filter replacement according to a fixed interval,
as
the rider will experience the symptom and
notice the filter blockage during vehicle usage.
The driveability remains normal as long as the fuel level
in
tank
is
maintained above the breather filter because no air will be drawn
into the pump chamber, even when the fuel filter
is
clogged.
If the fuel in tank is sufficient but such symptom as poor engine performance, lack
of
fuel,
or
engine start failure exist, perform the
fuel supply test (page 7-9).
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