Yamaha FZS1000N Service Manual page 318

CARBURETORS
EAS00504
CHECKING THE FUEL PUMP
1. Check:
fuel pump 1
a. Place a container under the end of the fuel
hose.
b. Start the engine and check if fuel flows from
the fuel hose 2 .
Fuel flows.
Fuel does not flow.
c. Stop the engine and check if the fuel stops
flowing from the fuel hose 2 .
Fuel stops flowing.
Fuel flows.
7-13
CARB
Fuel pump is OK.
Replace the fuel
pump.
Fuel pump is OK.
Replace the fuel
pump.