GF47.10-P-3004M On-Board Refueling Vapor Recovery Function

GF47.10-P-3004M On-board Refueling Vapor Recovery Function
- MODEL 215, 220 with ENGINE 275.950
- with CODE (494) USA version
- MODEL 230 with ENGINE 275.951
- with CODE (494) USA version up to Model Year 8
- MODEL 216, 221 with ENGINE 275.953
- with CODE (494) USA version up to Model Year 8
- MODEL 230 with ENGINE 275.954
- with CODE (494) USA version up to Model Year 8
- MODEL 215, 220 with ENGINE 275.980
- with CODE (494) USA version
- MODEL 230 with ENGINE 275.981
- with CODE (494) USA version up to Model Year 8
- MODEL 216, 221 with ENGINE 275.982
- with CODE (494) USA version up to Model Year 8
- MODEL 240 with ENGINE 285.950
- with CODE (494) USA version
- MODEL 240 with ENGINE 285.980
- with CODE (494) USA version





Shown on vehicle with fuel tank in luggage compartment
45 Filler neck with ORVR (because of its shape, acts as a suction jet pump)
45/1 Check valve
45/2 Float with flap
75 Fuel tank
75/1 Safety valve (rollover valve)
77 Activated charcoal canister
77/1 Pressure relief valve (opening pressure approx. 30 to 40 mbar)
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve
A Nozzle
a ORVR vent line
b Air intake around the nozzle
c Depressurization in open air (if pressure relief valve 77/1 is open)
d to engine

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

To satisfy these requirements, the filler neck is designed 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 around the nozzle, refueling vapors are not able to rise up at the filler neck and escape to the atmosphere.
They flow to the activated charcoal canister.
The refueling gases are stored in the activated charcoal canister and when releasing regeneration together with fuel gases out of the fuel evaporation control system, are suctioned off and burnt by engine.

1. Vehicles with fuel tank in luggage compartment 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 rapidly and overfilling is largely prevented. A check valve (45/1) prevents the quick increase of fuel in the filler neck. Two safety valves (rollover valves) are located in the fuel tank (75). If fuel flows to the high mounted safety valves (75/1), they close the vent line to the activated charcoal canister. Through powerful braking, accelerating or cornering the valves can also close briefly. If an excessively high pressure exists in the activated charcoal canister, the pressure relief valve (77/1) opens. In this special case the removal of pressure is performed via the activated charcoal canister shutoff valve (Y58/4) into the open air.
2. Vehicles with fuel tank at frame floor in front of rear axle The refueling vapors flow along the vent line to the expansion reservoir and on from there to the activated charcoal canister. A filler neck with valves is not necessary.

Ending refueling when the refueling nozzle switches off and the fuel tank is full. On no account overfill fuel tank as a result of refueling nozzle being switched on several times.





Shown on model 230 with engine 275.951
45 Filler neck (United States of America) with ORVR
45/2 Float with flap
55/1 Fuel filter with integrated overflow valve
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
M3 Fuel pump
Y58/4 Activated charcoal filter shutoff valve
a ORVR vent line
b To purge control valve
c Fuel line to engine