Removing The Fuel Hose; Checking The Injectors; Checking The Throttle Bodies; Checking The Rollover Valves - Yamaha XV19SW Service Manual

ET1D71026

REMOVING THE FUEL HOSE

1. Disconnect:
• Fuel hose (intake manifold assembly to pres-
sure regulator)
EC1D71014
CAUTION:
Although the fuel has been removed from
the fuel tank be careful when removing the
fuel hose, since there may be fuel remaining
in it.
NOTE:
• To remove the fuel hose from the fuel pipe or
pressure regulator, slide the fuel hose connec-
tor cover "1" on the end of the hose in the direc-
tion of the arrow shown, press the two buttons
"2" on the sides of the connector, and then re-
move the hose.
• Remove the fuel hose manually without using
any tools.
• Before removing the hoses, place a few rags in
the area under where they will be removed.
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EAS26980

CHECKING THE INJECTORS

1. Check:
• Injectors
Damage → Replace.
EAS26990

CHECKING THE THROTTLE BODIES

1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle bod-
ies as a set.
2. Check:
• Fuel passages
Obstructions → Clean.
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a. Wash the throttle bodies in a petroleum-
based solvent.
Do not use any caustic carburetor cleaning
solution.
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6-11
THROTTLE BODIES
b. Blow out all of the passages with compressed
air.
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ET1D71007

CHECKING THE ROLLOVER VALVES

1. Check:
• Rollover valve 1 "1"
• Rollover valve 2 "2"
Damage/faulty → Replace.
NOTE:
• Check that air flows smoothly only in the direc-
tion of the arrow shown in the illustration.
• The rollover valves must be in an upright posi-
tion when checking the airflow.
EAS27000

CHECKING THE PRESSURE REGULATOR

1. Check:
• Pressure regulator
Damage → Replace.
EAS27010
CHECKING THE PRESSURE REGULATOR
OPERATION
1. Check:
• Pressure regulator operation
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a. Remove the pressure regulator cover.
Refer to "THROTTLE BODIES" on page 6-6.
b. Disconnect the fuel hose "1" from the pres-
sure regulator "2".
c. Connect the fuel pressure adapter "3" be-
tween the fuel hose "1" and pressure regula-
tor "2".
d. Connect the pressure gauge "4" to the fuel
pressure adapter "3".
e. Connect the vacuum/pressure pump gauge
set "5" to the pressure regulator.
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