25
FUEL SYSTEM
CS-370ES
CS-420ES
4-5 Inspecting and replacing tank vent
NOTE: Tank vent prevents a vacuum from forming
in fuel tank when fuel in fuel tank is being consumed.
When pressure in fuel tank becomes too high, tank
vent releases the pressure.
1. Remove rear handle from engine cover (Refer to
“9-2 Inspecting cushions”). Remove tank vent (A)
from tank vent line and connect pressure tester
897803-30133 (B).
2. Apply pressure approx. 49 kPa (0.5 kgf/cm
2
) (7
psi), make sure pressure is stable in range of 9.8
kPa - 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
assembly. Damage to valves will occur.
4. Remove cap (C) of tank vent, and clean sponge
(D).
5. Cut pipe 363024-04010 (E: 7x11x170 mm) and
382011-01110 (F: 9x13x350 mm) in approx. 30 mm
(1 1/4 in) length, and connect them to pressure tester
as shown. Connect tank vent (G) without cap to pipe
as shown.
6. Plug hole (g) by finger and apply pressure 19.6
kPa (0.2 kgf/cm
2
) (3 psi). The pressure should be
hold steady.
7. When the finger is removed from hole (g), tank
vent should pass air freely without holding any
pressure. If it does not, replace tank vent with new
one.
A
B
g
G
C
F
E
D
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