Chapter 4: The Fuel System and Governor
33
4. The activated charcoal inside the canister
absorbs the hydrocarbons allowing the air to
pass through and out to the atmosphere.
5. When the engine is running, the vacuum inside
the carburetor insulator is used to draw the
vapors out of the charcoal canister, temporarily
enriching the fuel/air mixture, and is used in the
combustion process. See Figure 4.11.
Figure 4.11
Charcoal canister
Troubleshooting
Table 1:
Symptom Cause
Fuel leaking from
the carburetor
throat or vents
A blockage in the char-
coal canister or between
the canister and the tank.
Engine runs rich
• Raw gasoline in the
charcoal canister.
• A blockage in the line
between the char-
coal canister and the
carburetor insulator
plate.
Engine runs lean
• Wrong fuel cap
installed.
• Leak in the vacuum
lines.
Gasoline vapor
escaping from the
engine
• The charcoal canis-
ter is saturated.
• A blockage in the
line between the
charcoal canister
and the carburetor
insulator plate.
• Wrong fuel cap
installed.
• Leak in the vacuum
lines.
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