24
FUEL SYSTEM
CS-370ES
CS-420ES
4-4 Inspecting fuel tank and line
1. Clean fuel tank inside as required.
2. Remove cylinder cover, disconnect fuel line (A)
from carburetor.
3. Connect pressure tester 897803-30133 (B) to fuel
line.
NOTE: To connect pressure tester to fuel line easily,
it is recommended to use pipe joint V186-000020 (C).
4. Remove fuel cap and pull out fuel strainer from
fuel tank.
5. Pinch fuel line with needlenose pliers as shown.
NOTE: Wrap the ends of needlenose pliers with tape
(or cover with soft pipes) to prevent damage to fuel
line.
6. Apply pressure approx. 49 kPa (0.5 kgf/cm
2
) (7 psi).
7. If pressure drops, replace fuel line.
8. Put fuel strainer in fuel tank and fasten fuel cap
securely.
9. Apply pressure approx. 9.8 kPa (0.1 kgf/cm
2
) (1.4 psi).
10. Pressure should not drop. If the pressure drops,
leakage may occur from fuel cap, fuel cap O-ring,
mating surface of fuel tank on rear handle, grommet,
or tank vent. Inspect and replace defective part(s)
with new one.
11. Remove pressure tester and connect fuel line to
carburetor.
C
A
B
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