Refueling Vapor Recovery System: Description and Operation

GF47.10-P-3004CY On-board Refueling Vapor Recovery Function
- MODEL 204.0 /2 with ENGINE 272.947
- with CODE (494) USA version up to Model Year 8
- MODEL 204.0 with ENGINE 272.948
- with CODE (494) USA version up to Model Year 8
- MODEL 204.0 /2 with ENGINE 272.961
- with CODE (494) USA version up to Model Year 8
- MODEL 204.0 with ENGINE 272.971
- with CODE (494) USA version up to Model Year 8





1 Activated charcoal filter, chamber 1
2 Activated charcoal filter, chamber 2
3 Activated charcoal filter, chamber 3
45 Fuel filler neck
58 Fluid reservoir
75 Fuel tank
75/1 Refueling, limiting and bleed valve
75/2 Breather valve
77 Activated charcoal filter
B4/3 Fuel tank pressure sensor
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve
A Aeration line and vent line
B Purge line

The legislator demands:
- Refueling vapors in the vehicle must be recovered (ORVR = Onboard Refueling Vapor Recovery)
- Fuel and refueling gases must be separated in order to prevent fuel from flowing into the activated charcoal filter due to inappropriate refueling or a defective nozzle.

Thanks to its shape, the fuel filler neck functions as a suction jet pump. The fuel out of the nozzle accelerates through this in the filler neck and air is suctioned around the nozzle.
As a result of this air intake (in the fuel tank) around the nozzle, refueling vapors are not able to rise up at the fuel filler neck and escape into the atmosphere.
The refueling gases pass via the breather valve and aeration line and vent lines to the activated charcoal filter, where it is stored. The refueling, limiting valve and bleed valve also prevents overfilling by closing the aeration and vent line.

When the canister is regenerated (purge control valve actuated), the refueling vapors are drawn off by the engine and burned together with the fuel vapors from the fuel evaporation control system.

Rollover valves are integrated above in breather valves. If fuel passes to the breather valves, these close the aeration line and vent lines to the activated charcoal filter and thus prevents the fuel passing into the activated charcoal filter.
Breather valves can also close briefly in cases of powerful braking / accelerating or while cornering.

Stop refueling when the nozzle is switched off and the fuel tank is full! On no account overfilling fuel tank as a result of refueling nozzle being switched on several times.