Fuel Pump Description - Honda Motorcycle Service Manual

LIGHTSIMETERSISWITCHES
If the fuel warning light does not turn on, check as noted
below:
1. Check for battery voltage between the fuel level sensor
connector terminals.
1
t
No battery voltage
J.
Battery voltage
I
+
-
Faulty fuel level sensor
1
Poor connection
I
4
2 . Check for battery voltage between the battery side of the
indicator wire and ground.
I
NO batte:y voltage Battery Lollage
IGNITION MAIN
t 4
FUSE SWITCH FUSE
Faulty sub fuse
.
Burnt bulb
a
Faulty ignition switch
-
Broken wire between the
Poor connection of the warning light and sensor
fuse holder connector Faulty ground
FUEL PUMP
DESCRIPTION
Certain models are equipped with a low pressure electromag-
netic fuel pump to supply fuel to the carburetor.
When the engine is started, the switch is turned on by the
function of the fuel cut-off relay (refer to the description of
fuel cut-off relay), which generates an electromagnetic force
at the coil and moves the plunger and diaphragm up. Valve
A
is then opened by vacuum action and the fuel flows into the
diaphragm chamber. The plunger pushes the switch up and
turns it off. As the electromagnetic force at the coil is shut
down. the plunger and diaphragm are returned by the spring
and the fuel in the diaphragm chamber is sent t o the carbu-
retor through valve B.
Certain models of this fuel pump have a built-in fuel cut-off
relay.
SWITCH
SPRING
\
/
VALVE A VALVE B
Date of Issue: March, 1995
0
HONDA MOTOR CO.,LTD