- Fuel pressure
a. Remove the fuel tank bolt and holdup the fuel tank.
b. Disconnect the fuel hose "1" from the fuel tank.
Cover fuel hose connections with a cloth when disconnecting them. Residual pressure in the fuel lines could cause fuel to spurt out when removing the hoses.
Notice: Be sure to disconnect the fuel hose by hand. Do not forcefully disconnect the hose with tools.
![](https://motoinstruction.ru/img/yamaha/20/126874.jpg)
c. Connect the pressure gauge "2" and adapter "3" to the fuel hose "1".
Pressure gauge 90890-03153 YU-03153.
Fuel pressure adapter 9089003176 YM-03176.
![](https://motoinstruction.ru/img/yamaha/20/126875.jpg)
d. Start the engine.
e. Measure the fuel pressure.
Fuel pressure 324.0 kPa (3.24 kgf/cm², 47.0 psi).
Faulty → Replace the fuel pump.