FUEL SYSTEM AND GOVERNOR
43
This system operates as follows:
1. The gasoline evaporate and lets off vapors.
2. The vapors exit the fuel tank through the roll over
valve vent.
NOTE: The fuel cap used with the charcoal canister sys-
tem is not vented. If a vented cap is used, the
EVAP system will not work.
See Figure 4.9.
NOTE: The new EPA standard also requires the fuel caps
to be tethered to the fuel tank.
3. The vapors are routed through the charcoal canister.
See Figure 4.10.
4. The activated charcoal inside the canister absorbs
the hydrocarbons allowing the air to pass through
and out to the atmosphere.
5. The second line on the charcoal canister goes to the
control panel. When the engine is running, vapors
are drawn out of the charcoal canister by the air
being drawn into the carburetor. This re-charges the
canister of the next down period.
See Figure 4.11.
Figure 4.9
Unvented
Tethered
Figure 4.10
Charcoal canister
Vapor
Figure 4.11
Charcoal canister
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