EMISSION CONTROL - K SERIES KV6 Vapour Separator The vapour separator is installed at the front of the RH rear wheel arch, behind the wheel arch liner. The vapour separator prevents the charcoal in the EVAP canister being saturated with fuel, by separating any liquid from the vapour vented from the fuel tank. Separated fuel from the vapour separator drains back to the fuel tank through the vent pipe. EVAP Canister The EVAP canister is installed at the front of the RH rear wheel arch, behind the wheel arch liner. Charcoal in the EVAP canister absorbs and stores fuel from the vapour vented from the fuel tank. When the engine is running, fuel is purged from the EVAP canister when the purge valve opens and clean air is drawn through the charcoal. EVAP Canister
1 Canister housing 2 Purge valve connection
3 Vapour separator connection 4 DMTL connection
Purge Valve The purge valve is installed on the inlet manifold chamber, next to the throttle body, and connected to the EVAP canister by a vent pipe installed on the underside of the vehicle, next to the fuel delivery pipe. The purge valve is controlled by the Engine Control Module (ECM) and remains closed below a preset coolant temperature and engine speed, to protect engine tune and catalytic converter performance. When engine operating conditions are suitable, the ECM opens the purge valve and the depression in the inlet manifold draws fuel vapour from the EVAP canister. DMTL The DMTL is connected to the atmospheric vent of the charcoal canister and incorporates an electric air pump, a normally open change-over valve and a 0.5 mm (0.020 in) reference orifice. The DMTL operates only after the ignition is switched off and is controlled by the ECM, which also monitors the air pump and the change-over valve for faults. Air Filter The air filter prevents dust being drawn into the EVAP system. A breather tube connects the DMTL to the air filter, which is located above the RH rear wheelarch liner, immediately below the fuel filler cap.
17-3-8
DESCRIPTION AND OPERATION
