Checking The Pressure Regulator - Yamaha F150B Service Manual

FUEL

Checking the pressure regulator

1. To connect the special service tool a,
see "Measuring the fuel pressure" (6-4)
step 1–step 3.
2. Disconnect the pressure regulator hose
b, and then connect the special service
tool c to the pressure regulator d.
e
Fuel pressure gauge a: 90890-06786
Vacuum/pressure pump gauge set c:
90890-06756
3. Clog the pressure regulator hose end
during the measurement.
4. Start the engine
WARNING! Make sure that the drain
screw e is tightened securely, before
starting the engine.
5. Check that the fuel pressure is reduced
when vacuum pressure is applied to the
pressure regulator. If the fuel pressure is
not reduced, replace the pressure regu-
lator.
6. Turn the engine start switch to "OFF."
7. Disconnect the special service tool c,
and then connect the pressure regulator
hose b.
8. To disconnect the special service tool a,
see "Measuring the fuel pressure" (6-4)
step 7–step 8.
6-5
Fuel system
b
d
c
a
and let it idle.