Echo CS-310

FUEL SYSTEM
CS-310
25
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 cylinder cover and starter assembly
referring to “2-1 Disassembling starter assembly“.
Remove tank vent (A) from fuel tank and connect
pressure tester 91024 (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 valves in tank vent as-
sembly. Damage to valves 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