GF47.10-P-3004AM ON-Board Refueling Vapor Recovery Function

GF47.10-P-3004AM On-board Refueling Vapor Recovery Function
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

45 Fuel filler neck
75 Fuel tank
77 Activated charcoal canister
91/2 Vent line (refueling vapors to expansion reservoir)
92 Purge line
93 Expansion reservoir
93/1 Safety valve (rollover valve)
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve a Air line (from expansion reservoir to activated charcoal canister) d Fuel gases to the engine





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

45 Fuel filler neck
45/2 Float with flap
55/1 Fuel filter
75 Fuel tank
75/1 Safety valve (rollover valve)
75/2 Ventilation pipe of ORVR
77 Activated charcoal canister
B4 Fuel level sensor
B4/3 Fuel tank pressure sensor (integrated in the fuel level sensor)
M3 Fuel pump
Y58/4 Activated charcoal filter shutoff valve

a Vent line (to activated charcoal canister)
b Fuel gases to purge control valve (Y58/1)
c Fuel line to engine

The US legislature requires that:

^ Refueling vapors in the vehicle must be recovered (ORVR = On-board Refueling Vapor Recovery)
^ 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).