Refueling vapor recovery - function - GF47.10-P-3004SM

MODEL 203 with ENGINE 113.988 with CODE (494) USA version

MODEL 209 with ENGINE 113.987 with CODE (494) USA version

MODEL 215 with ENGINE 113.986 with CODE (494) USA version

MODEL 220 with ENGINE 113.986 with CODE (494) USA version

Fig 1: Identifying Fuel Tank Components - Model 203 With Engine 113.988 With Code (494) (1 Of 2)

Fig 2: Identifying Fuel Tank Components - Model 203 With Engine 113.988 With Code (494) (2 Of 2)

The US legislature requires that:

Refueling vapors in the vehicle must be caught (ORVR = O n-board 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 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 sucked in.

The result of this air intake is that refueling vapor are not able to gather at the filler neck and therefore not are able to escape.

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

Model 203, 209

The refueling vapor flows to the expansion reservoir (93) through the vent line (91/2) and from there out through the safety valve (rollover valve) (93/1) and further to the activated charcoal canister through the vent line (a).

Except models 171, 215, 220

The refueling vapor flows through the safety valves (rollover valves) (75/1), through the ORVR vent 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. The fuel cannot therefore enter the activated charcoal canister. The safety valves can also close briefly on powerful braking / accelerating or while cornering.

If the fuel tank is full, the float with the flap (45/2) closes the 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 (around 2.7 to 3.5 liters).

Component description for the activated charcoal canister	77	GF47.30-P-2010SM
Component description for the fuel tank pressure sensor	B4/3	GF47.30-P-2100SM
Component description for the activated charcoal filter shutoff valve	Y58/4	GF47.31-P-2100SM