Technical Features - Honda CBF190WH 2016 Shop Manual

GENERAL INFORMATION

TECHNICAL FEATURES

FUEL PUMP SYSTEM WITH A FUEL FILTER BLOCKAGE REMINDER FUNCTION
To FUEL INJECTOR
The fuel pump system of this model consists of the following components:
– Fuel pump chamber
– Fuel filter
– Breather passage
– Breather filter
Under normal condition, 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 consumed
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.
1-22
FUEL TANK
FUEL PUMP
PUMP CHAMBER
FUEL FILTER
: Air suction passage under fuel filter blockage
: Air discharge passage under normal fuel filter condition
: Fuel flow under normal fuel filter condition
BREATHER FILTER
FUEL LEVEL
BREATHER
PASSAGE