Yamaha FZR400 1988-1989 Service Manual page 375

FUEL SYSTEM
FUEL PUMP TEST
Operation
The diaphragm is pulled in by the plunger allow-
ing 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 plunger with the dia-
phragm forcing fuel into the fuel chamber.
NOTE:
When the main and "ENGINE STOP" switches
are ON, the fuel pump relay is activated for five
operates.
Diaphragm
Plunger
O u t l e t
Inspection
1. Connect:
Battery ( 12V)
??
2. Inspect:
@Fuel pump
Cracks/Damage -+ Replace.
3. Check:
Fuel pump operation
??
Faulty operation -j. Replace.
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