Fuel Pump; Inspecting The Check Valve; Inspecting The Fuel Pumps - Yamaha SX150C Service Manual

FUEL

FUEL PUMP

4230

INSPECTING THE CHECK VALVE

Inspect:
• Check valve operation
Damage/reverse air flow → Replace.
Inspecting steps
NOTE:
Do not overpressurize the check valve.
Excessive pressure may cause air to leak
out.
(1) Install the Mity vac onto the check
valve as shown.
Mity vac
YB-35956 / 90890-06756
(2) Apply the specified pressure with the
Mity vac.
Check valve pressure
80 kPa (0.8 kg/cm
NOTE:
Make sure no air comes out of the opposite
side of the check valve.

INSPECTING THE FUEL PUMPS

1. Inspect:
• Diaphragm
• Fuel pump valves
Damage → Replace.
2. Inspect:
• Fuel pump
Reverse air flow → Replace.
4-26
E
2
, 11.4 psi)