Yamaha FZR400 Fuel Pump Circuit Diagram (1989). The fuel pump circuit consists of the fuel pump relay, fuel pump, “ENGINE STOP” switch and digital ignition unit. The digital ignition unit includes the control unit for the fuel pump. The fuel pump starts and stops as indicated in the chart below. The following schematic illustrates the Yamaha FZR400 Fuel Pump Circuit Diagram.

Yamaha FZR400 Fuel Pump Circuit Diagram

1. To main fuse and battery
2. Main switch
3. “ENGINE STOP” switch
4. Digital igniter unit
5. Fuel pump relay
6. Fuel pump

FUEL PUMP TEST

The diaphragm is pulled in by the plunger allowing fuel to be sucked into the fuel chamber. Fuel is pushed out from the pump until carburetor 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 diaphragm forcing fuel into the fuel chamber.



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