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FUEL
OIL 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.
4-27
E
2
, 11.4 psi)
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