Yamaha VMX12 2001 Service Manual page 271

CARBURETORS
EAS00504
CHECKING THE FUEL PUMP
1. Check:
• fuel pump
a. Remove the top cover and air filter case.
Refer to "TOP COVER AND COVERS" and
"AIR FILTER CASE AND ELECTRICAL
COMPONENTS BOARD" in chapter 3.
b. Disconnect the fuel hose (fuel pump to car-
buretor) 1 from the carburetor.
c. Place a container under the end of the fuel
hose.
d. Install the top cover and air filter case.
Refer to "TOP COVER AND COVERS" and
"AIR FILTER CASE AND ELECTRICAL
COMPONENTS BOARD" in chapter 3.
e. Start the engine and check if fuel flows from
the fuel hose 1.
Fuel flows.
Fuel does not flow.
f. Stop the engine and check if the fuel stops
flowing from the fuel hose 1.
Fuel stops flowing.
Fuel flows.
6 - 11
CARB
Fuel pump is OK.
Replace the fuel
pump.
Fuel pump is OK.
Replace the fuel
pump.