Fuel evaporation control system, function - GF47.30-P-3013BK

MODEL 219 with ENGINE 113.967 

MODEL 164.1 with ENGINE 113.964 up to Model Year 08/modification year 07 

MODEL 251 with ENGINE 113.971 up to Model Year 08/modification year 07 

Shown on model 219 

The fuel evaporation control system prevents fuel vapors escaping to atmosphere. This is done by storing the fuel vapors temporarily in the activated charcoal canister.

When the engine is running, the fuel vapors stored in the activated charcoal canister, are drawn off due to the intake manifold vacuum and combusted in the engine. The purge switchover valve carries out metering of fuel vapor from the activated charcoal canister and to do this is actuated on the ground side by the ME-SFI [ME] control unit.

Purging of the activated charcoal canister takes place at:

• Coolant temperature > 40°C
• Locking time after engine start elapsed, approx. 45 seconds
• Deceleration fuel shutoff inactive.

To prevent pulse noise caused by pulsing of the purge switchover valve, a damper reservoir is located upstream of the valve.

The idle speed control prevents changes in engine speed resulting from purging. A richer or leaner fuel-air mixture is produced in line with the charge of the activated charcoal canister with fuel vapors.

Air admission to fuel tank 

Air is admitted through the activated charcoal canister. The air flows through the ventilation connection at the activated charcoal canister (77) into the fuel tank (75).

Air release from fuel tank 

The fuel tank is vented through the activated charcoal canister. In this case, the fuel vapors flow to the activated charcoal canister where they are stored, or if purging is activated, they are drawn off into the intake manifold.

During refueling the fuel vapors are collected additionally from the fuel tank and passed on to the activated charcoal filter (ORVR = Onboard Refueling Vapor Recovery). An activated charcoal canister is used with around 3.5 liter capacity.

The activated charcoal canister shut off valve and the tank pressure sensor are required for the leak test.

	ME-SFI [ME] control unit, component description		GF07.61-P-6000BK
	Coolant temperature sensor, component description		GF07.04-P-6040BK
	Component description for the purge control valve		GF47.30-P-2020BK
	Activated charcoal canister, component description		GF47.30-P-2010BK
	Purge control valve actuation, function		GF07.61-P-3013BK
	Purge system with leak test function		GF47.30-P-3016BK
	Component description for fuel tank	Model 219	GF47.10-P-2000BK
		Model 164.1, 251	GF47.10-P-2000BM