Yamaha F150A Service Manual page 183

3. Disconnect the pressure regulator hose
"1", and then connect the special service
tool "2" to the pressure regulator "3".
4. Block the end of the pressure regulator
hose "1" using a rubber plug "4".
Vacuum/pressure pump gauge set "2":
90890-06945
5. Start the engine and let it idle.
6. Check that the fuel pressure is reduced
when negative pressure is applied to the
pressure regulator.
7. Turn the engine start switch to OFF.
8. Disconnect the special service tool, and
then connect the pressure regulator
hose.
9. Disconnect the special service tools. See
step 6 in "Measuring the fuel pressure"
(6-5).
2
1
4 3
2
6-6
Fuel line
0
1
2
3
4
5
6
7
8
9
10
A