Checking The Check Valve - Yamaha F150A Service Manual

WARNING
• When connecting the fuel pressure
gauge, first cover
between the gauge and the pressure
check valve with a clean, dry rag to pre-
vent fuel from leaking out.
• Gently screw in the gauge until it is
firmly connected.
4. Start the engine and let it idle.
5. Check that the fuel pressure reduces
when vacuum pressure is applied to the
pressure regulator. If the fuel pressure
does not reduce, replace the pressure
regulator.
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 check valve

1. Connect the special service tool to the
check valve.
2. Apply pressure to each check valve port.
Replace if necessary.
63P3F11
the connection
Intake assembly and vapor separator
Vacuum/pressure pump gauge set:
90890-06756
NOTE:
Check that no air comes out of the opposite
end of the check valve.
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