Buell 2003XB9S Service Manual page 430

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EVAPORATIVE EMISSIONS CONTROL-CA MODELS
GENERAL
Buell motorcycles sold in the state of California are equipped
with an evaporative (EVAP) emissions control system. The
EVAP system prevents fuel hydrocarbon vapors from escap-
ing into the atmosphere and is designed to meet the Califor-
nia Air Resource Board (CARB) regulations in effect at the
time of manufacture.
The EVAP functions in the following manner:
Hydrocarbon vapors in the fuel tank are directed through
the vent valve and stored in the carbon canister. If the
vehicle is tipped at an abnormal angle, the vent valve
closes to prevent liquid gasoline from leaking out of the
fuel tank through the fuel tank vent hose.
When the engine is running, manifold venturi negative
pressure (vacuum) slowly draws off the hydrocarbon
vapors from the carbon canister through the canister
vent hose. These vapors pass through the throttle body
manifold and are burned as part of normal combustion in
the engine.
TROUBLESHOOTING
1 1
WARNING WARNING
Verify that the evaporative emissions system hoses do
not contact hot exhaust or engine parts. The hoses con-
tain flammable vapors that can be ignited if damaged,
which could result in death or serious injury.
The system has been designed to operate with a minimum of
maintenance. Check that all hoses are properly routed and
connected and are not pinched or kinked.
8915
2
1
1. Canister
2. Fuel tank vent hose (to fuel tank vent valve)
3. Canister vent hose (to intake manifold)
Figure 4-112. Carbon Canister Installation.
REMOVAL
Vent Valve
1. Remove vent valve. See
2. If necessary, label fuel tank vent hose at canister fitting
and remove.
Canister
1. See Figure 4-112. Label and disconnect the fuel tank
vent hose (2) and canister vent hose (3) from the canis-
ter.
2. Slide canister towards rear of vehicle to disengage from
mounting plate.
2003 Buell XB9S: Fuel System 4-121
4.44
3
4.39 FUEL TANK VENT VALVE.