Inspecting Diaphragm - Echo CS-600 Service Manual

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CS-600

FUEL SYSTEM

4-12 Inspecting diaphragm

1. Inspect metering diaphragm (A) for hardening,

distortion, or pin hole. Replace as required.

2. Remove pump cover (B), pump diaphragm (C)

and pump gasket (D).

3. Inspect pump diaphragm (C) and replace if

hardened or curled at valve tabs.

4. Inspect metering gasket (E) and pump gasket (D)

and replace if defective.

5. Inspect inlet screen (F) if blocked, remove and

clean it, or replace.

6. Clean fuel passages in carburettor body with

compressed air.

NOTE: Before cleaning metering side with com-

pressed air, turn "H" needle clockwise until lightly

seated and remove inlet needle valve. Otherwise,

main nozzle check valve and inlet needle valve

spring may be damaged by the compressed air.

NOTE: When cleaning pump side with compressed

air, take care not to blow inlet screen (F) away.

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