Checking The Pressure Regulator - Yamaha F80B Service Manual

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:
90890-06942
Fuel pressure gauge 2:
90890-06786
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.
6D93G11
1
S6D84190
the connection
2
, 43.5 psi)
2
, 37.7 psi)
Fuel pressure (reference data):
230 kPa (2.3 kgf/cm
WARNING
• Before measuring the fuel pressure,
make sure that the drain screw is tight-
ened securely.
• Do not loosen the drain screw while
measuring the fuel pressure. Loosening
the drain screw can cause fuel to spray
out creating a fire hazard.
• After measuring the fuel pressure, cover
the end of the hose with a clean, dry rag,
point the hose downward, and then
loosen the drain screw to drain the
remaining fuel from the hose and gauge.
• When storing the fuel pressure gauge,
make sure that the drain screw is tight-
ened securely.

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.
Vapor separator
2
, 33.4 psi)
1
2
3
4
5
6
7
8
9
4-14