Yamaha VMX12H Supplementary Service Manual page 358

FUEL PUMP SYSTEM
(2)
Troubleshooting chart
Fuel pump fails to operate for a
engine stop switches turned t o "ON" and fuel reserve switch turned to
Stop the engine and turn on the main/
engine stop switches and measure the fuel
pump input voltage
Less than 11V
lead).
Check fuel pump relay ground lead.
Replace fuel pump relay.
7-55
5 interval when carburetor fuel level is low with the main/
More than
Check fuel pump, replace if necessary.
More than
lead).
Turn the fuel reserve switch to "RES"
and measure the fuel pump input voltage
stop switches, main
I
Correct ground lead.
"RES".
More than
lead).
relay input voltage
Check reserve switch,
replace if necessary.
I
I
lead).
I
I