FUEL SYSTEM
CS-501SX, CS-501SXH
501sx
24
4-4 Inspecting and replacing tank vent
NOTE:
Tank vent prevents a vacuum from forming
in fuel tank when fuel in fuel tank is being con-
sumed. When pressure in fuel tank becomes too
high, tank vent releases the pressure.
1. Remove cleaner lid, air fi lter and cylinder cover.
Remove tank vent (A) from fuel tank (Refer to “9-1
Replacing cushions”) and connect Pressure / vac-
uum tester 91149 (B).
2. Apply pressure approx. 49 kPa (0.5 kgf/cm
2
) (7
psi). Make sure pressure is stable in range of 9.8 -
39.2 kPa (0.1 - 0.4 kgf/cm
2
) (1.4 - 5.7 psi).
3. If it is not in the range, gently clean tank vent
with compressed air or replace with new one.
NOTE:
Do not disassemble valve in tank vent as-
sembly. Damage to valve will occur.
4. Apply negative pressure 19.6 kPa (0.2 kgf/cm
2
) (3
psi).
5. Tank vent should pass air freely without holding
any pressure. If it does not, replace tank vent with
new one.
A
B
A
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