Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 289 / 398

FUEL TANK
7-4
3. Connect:
• Fuel pump coupler
4. Install:
• Air scoop (left/right)
•
Seat
• Side cover (left/right)
Refer to “GENERAL CHASSIS” on page 4-1.
EAM30268
CHECKING THE FUEL PRESSURE
1. Check:
• Fuel pressure
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the side cover (left/right), the seat
and the air scoop (left/right).
Refer to “GENERAL CHASSIS” on page 4-1.
b. Remove the fuel tank bolt and lift the fuel
tank.
c. Disconnect the fuel hose from the fuel pump.
Refer to “REMOVING THE FUEL TANK” on
page 7-2.
WARNING
EWA19380
Cover the fuel hose connection with a cloth
when disconnecting it. This is because re-
sidual pressure in the fuel hose could cause
fuel to spurt out when the hose is removed.
NOTICE
ECA24750
Make sure that the fuel hose is disconnected
by hand. Do not forcibly disconnect the hose
with tools.
d. Connect the pressure gauge “1” and the fuel
pressure adapter “2” to the fuel hose.
e. Start the engine.
f. Measure the fuel pressure.
Out of specification

Replace the fuel
pump.
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EAM30269
CHECKING THE DAMPER
1. Check:
•
Damper 1 “1”
• Damper 2 “2”
•
Damper 3 “3”
Wear/damage

Replace.
TIP
•
Affix dampers 1 and 3 with the arrow on each
damper pointing outward.
•
Affix the damper 2 with its projection “a” facing
the rear of the vehicle.
EAM30270
CHECKING AND REPLACING THE
PROTECTOR
1. Check:
•
Protector “1”
Wear/damage

Replace.
TIP
Affix the protector as shown.
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel pressure adapter
90890-03186
Fuel pressure adapter
YM-03186
1
Fuel line pressure (at idle)
300–390 kPa (3.0–3.9 kgf/cm²,
43.5–56.6 psi)
1
2
(3.31 in) (4.53 in)
84 mm 115 mm
3 1
1 3
a
2
(3.31 in) (4.53 in)
84 mm 115 mm