Checking The Pressure Regulator - Yamaha F90D Service Manual

1
2
WARNING
• When connecting the fuel pressure
gauge, first cover
between the gauge and the adapter with
a clean, dry rag to prevent fuel from
leaking out.
• Gently screw in the gauge until it is
firmly connected.
Fuel pressure gauge adapter B 1:
YB-06942
Fuel pressure gauge 2: YB-06766
4. Turn the engine start switch to ON, and
then measure the fuel pressure within 3
seconds.
NOTE:
The fuel pressure decreases 3 seconds after
the engine start switch is turned to ON.
Fuel pressure (reference data):
300 kPa (3.0 kgf/cm
5. Measure the fuel pressure 3 seconds
after turning the engine start switch to
ON.
Fuel pressure (reference data):
260 kPa (2.6 kgf/cm
6. Start the engine, warm it up for 5 min-
utes, and then measure the fuel pres-
sure. If below specification, check the
high-pressure fuel line and the vapor
separator.
6D81G11
S6D84110
the connection
2
, 43.5 psi)
2
, 37.7 psi)
Fuel pressure (reference data):
230 kPa (2.3 kgf/cm

Checking the pressure regulator

1. Disconnect the quick connector from the
fuel rail.
NOTE:
Before disconnecting the quick connector,
release the fuel pressure.
2. Connect fuel pressure gauge adapter B
between the quick connector and fuel
rail.
3. Connect the fuel pressure gauge to fuel
pressure gauge adapter B.
4. Disconnect the pressure regulator hose,
and then connect the special service
tools to the pressure regulator.
WARNING
• When connecting the fuel pressure
gauge, first cover
between the gauge and the adapter with
a clean, dry rag to prevent fuel from
leaking out.
• Gently screw in the gauge until it is
firmly connected.
Fuel pressure gauge: YB-06766
Fuel pressure gauge adapter B:
YB-06942
Pressure/vacuum tester:
YB-35956-A
5. Start the engine and let it idle.
Vapor separator
2
, 33.4 psi)
1
2
3
4
5
6
S6D84120
7
the connection
8
9
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