Carburetor Removal - Mercury 6 Service Manual

FUEL DELIVERY SYSTEM
Problem: Fuel Blowback Out of Carburetor
Problem: Unable to Reduce Engine RPM to Slow Idle
Possible Cause
Chipped or broken reeds on reed block.
Problem: Rough Idle
Possible Cause
Excessive preload on reeds.
Problem: Engine Runs Too Lean
Possible Cause
Carburetor is loose. Air leaks past mixing chamber
cover.
Fuel level is too low.
Clogged high speed jet.
Restricted fuel flow to carburetor.
Incorrect high speed jet.
Idle mixture set too lean.
Air leakage into fuel system.
Anti-siphon valve restricting fuel flow.

Carburetor Removal

1. Loosen primer cam retaining screw.
2. Remove retaining clip.
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Page 3A-14
Screw
Retaining clip
Corrective Action
Replace reeds.
Corrective Action
Replace reeds.
Corrective Action
Tighten bolts securely. Tighten cover or replace
gasket.
Reset float level.
Inspect jet for varnish or debris and clean.
Check fuel lines and filters for restricted flow.
Refer to main jet chart and replace with proper jet.
Adjust to run richer. Turn idle mix screw
counterclockwise.
Inspect fuel line connections, hose clamps, fuel
pump and fuel outlet tube (located in fuel tank) for
loose fittings.
Inspect valve and/or test engine without valve in
fuel system.
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90827242R02 FEBRUARY 2003