Evaporative Control System - Engine Running - Triumph Thunderbird Service Manual

Fuel System/Engine Management
Evaporative Control System - Engine Running
When the engine is started, vacuum from the engine is applied through pipe C to the vacuum switch on the canister,
causing the canister return valve to open. Direct return of vapour, along pipe B, to the throttle bodies is prevented by the
purge control valve which is governed by the engine management system. When open, the valve allows stored vapour to
return to the throttle bodies where it enters the engine and is burnt in the cylinders.
The purge control valve is shuttled between the open and closed position during purging to prevent transient rich mixture
and high emissions.
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SelVice Manual - Thunderbird
10.123