Yamaha Vmax VMX12N, Supplementary Service Manual

Page: 360 / 405

FUEL PUMP SYSTEM
Lead Color
R/W R
Switch Position
"FUEL" (RESERVE) SWITCH TEST
Pocket Tester on the "Ohm x 1"
position.
Switch may be checked for continuity with a
OFF
ON
0 0
FUEL PUMP RELAY TEST
1. Remove:
cover
(left)
pump operation
2. Check:
Refer to "FUEL PUMP TEST" section.
3. Measure:
*Battery voltage
Use the Pocket Tester
Out of specification Replace relay.
Main and engine stop switches are
"ON" po-
sition.
Fuel Pump Relay Input Voltage:
12v
Black
FUEL PUMP TEST
Ope ration
The diaphragm is pulled left by the plunger
allowing fuel to be sucked into the fuel chamber.
Fuel is pushed out from the pump until carb
float chamber is filled with fuel, and then the
cut-off switch cuts off the circuit.
When the spring pushes the diaphragm further
to the end, the cut-off switch turns on and the
solenoid coil pulls the plungerwith the diaphragm
forcing fuel into the fuel chamber.
NOTE:
When the main and engine stop switches are
ON,
the fuel pump relay is activated for five
seconds a t which time the fuel pump operates.
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