Checking The Pressure Regulator - Yamaha F225F Service Manual

9. Disconnect the special service tools a
b.
and
disconnecting the special service
tools, cover the end of the hose using
a clean and dry rag. Also, make sure
that the drain screw a is tightened
securely, before measuring the fuel
pressure.
10. Connect the quick connector to the fuel
rail.
11. After measuring the fuel pressure, cover
the end of the hose with a clean and dry
rag so that the hose end is pointing
down. Loosen the drain screw to drain
the remaining fuel from the hose and the
gauge. WARNING! When storing the
fuel pressure gauge, make sure that
the drain screw is tightened securely.

Checking the pressure regulator

1. Reduce the fuel pressure. See "Reducing
the fuel pressure" (6-6).
2. Disconnect the quick connector from the
fuel rail. See steps 2 and 3 in
"Disconnecting the quick connector" (6-
6).
3. Connect the special service tools. See
steps 3 and 4 in "Measuring the fuel
pressure" (6-7).
4. Disconnect the pressure regulator hose
a, and then connect the special service
tool b to the pressure regulator c.
c
a
WARNING! Before
b
Vacuum/pressure pump gauge set b:
90890-06756
5. Block the end of the pressure regulator
hose a using a rubber plug.
6. Start the engine and let it idle.
7. Check that the fuel pressure is reduced
when negative pressure is applied to the
pressure regulator.
8. Turn the engine start switch to OFF.
9. Disconnect the special service tool b,
and then connect the pressure regulator
hose a.
10. Reduce the fuel pressure. See "Reducing
the fuel pressure" (6-6).
11. Disconnect the special service tools. See
steps 9–11 in "Measuring the fuel
pressure" (6-7).
Fuel system
0
1
2
3
4
5
6
7
8
9
10
A
6-8