On-board refueling vapor recovery function - GF47.10-P-3004AM

MODEL 211, 219 with ENGINE 113.990 with CODE (494) USA version

MODEL 215, 220 with ENGINE 113.991 with CODE (494) USA version

MODEL 230 with ENGINE 113.992 /995 with CODE (494) USA version up to Model Year 2008

MODEL 463 up to 31.5.12 with ENGINE 113.993 with CODE (491) USA version

Vehicle with a fuel tank (model 211, 219) located at low position

Fig 1: Identifying On-Board Refueling Vapor Recovery Function Diagram (Located At Low Position)

Courtesy of MERCEDES-BENZ USA

Vehicles with a fuel tank (models 211, 219) located at high position

Fig 2: Identifying On-Board Refueling Vapor Recovery Function Diagram (Located At High Position)

Courtesy of MERCEDES-BENZ USA

The US legislature requires that:

Refueling vapors in the vehicle must be recovered (ORVR = O nboard R efueling V apor R ecovery)
Fuel and refueling vapor must be separated in such a manner that no fuel is able to enter the activated charcoal canister, even if refueling is not done correctly or if the nozzle is defective.

Owing to its form, the fuel filler neck (45) functions as a suction jet pump. The fuel from the nozzle accelerates in the filler neck and thus air around the nozzle is suctioned.

As a result of this air intake. the refueling vapor are not able to gather at the filler neck and are able to escape.

The refueling vapor is stored in the activated charcoal canister (77) and are suctioned off and burnt by the engine when purging together with the fuel vapor from the fuel evaporation control system is released.

Models 211, 219

The refueling gases flow through the aeration line (91/2) to the expansion reservoir (93). They then flow through the safety valve (93/1) via the aeration line (a) from the expansion reservoir to the activated charcoal canister.

Except models 211, 219

The refueling gases flow through the safety valves (75/1) via the aeration line (a) to the activated charcoal canister.

If the fuel reaches the two high safety valves, the valves close the vent line to the activated charcoal canister. As a result, fuel is not able to enter the activated charcoal canister. The safety walls can also close briefly on powerful braking / accelerating or while cornering.

If the fuel tank is full, the float (45/2) with flap shuts off the fuel filler neck at the bottom. This ensures that the refueling nozzle shuts off more rapidly and overfilling is largely prevented.

The activated charcoal canister has a larger volume for ORVR (ca. 2.7 to 3.5 l).

Fuel tank - location/design/function	Models 211, 219	GF47.10-P-3000TK
	Models 215, 220	GF47.10-P-3000KM
	Model 230	GF47.10-P-3000RM
	Model 463	GF47.10-P-3000GM
Activated charcoal canister - location/task/design/function		GF47.30-P-3102AM