Fuel evaporation control system function - GF47.30-P-3013L
MODELS 129
with ENGINES 104.943 /991 as of 1.8.96,
112.923/943, 113.961, 119.982, 120.983
MODELS 140
with ENGINES 104.944 /994 as of 1.8.96, 119.981/980,120.982
MODELS 163 with ENGINES 112.942 /970, 113.942 /965
MODELS 170
with ENGINES 111.946 as of 1.6.98,
111.943/973,112.947
MODELS 202
with ENGINES 111.921 as of 1.9.98, 111.974,
111.975 as of 1.8.96,
111.944/945,112.910,
104.941 as of 1.8.96,
112.920
MODELS 208 with ENGINES 111.944/945/975, 112.940, 113.943
MODELS 210
with ENGINES 104.995,
111.942 as of 1.9.98,
111.947, 112.911 /914/921 /941, 113.940, 119.985/980
MODELS 220 with ENGINES 112.922 /944 /972 /975, 113.941 /948 /960 /966, 137.970
MODELS 215 with ENGINES 113.960, 137.970
MODELS 203 with ENGINES 112.912 /916 /946 /953
MODELS 230 with ENGINES 112.973, 113.963
MODELS 211 with ENGINES 112.913 /917 /949 /954, 113.967 /969
MODELS 209 with ENGINES 112.912 /955, 113.968
Shown on Engine 119
Shown on engine 120
The evaporative emission control system prevents fuel vapors escaping to atmosphere. This is done by storing the fuel vapors temporarily in the activated charcoal canister.
When the engine is running, the fuel vapors stored in the activated charcoal canister, are drawn off through the purge control valve and combusted in the engine. The activated charcoal canister is purged (re-generated) at:
- coolant temperature > 70°C
- blocking time after engine start elapsed, approx. 2 minutes
- engine not in deceleration mode
The purge quantity is controlled by the ME-SFI control unit operating the purge control valve. The purge quantity is determined by constantly opening and closing the purge control valve for on and off periods of various lengths.
The idle speed control prevents changes in engine speed resulting from purging. Depending on the level of charge of fuel vapor in the activated charcoal canister, the fuel-air mixture becomes richer or leaner.
Air admission to fuel tank
Air is admitted through the activated charcoal canister. Here either air is sucked out of the aeration/vent line on the activated charcoal canister or fuel vapors are sucked out of the activated charcoal canister into the fuel tank.
Air release from fuel tank
The fuel tank is vented through the activated charcoal canister. The fuel vapors flow to the activated charcoal canister, where they are stored or drawn into the intake manifold in case of simultaneous regeneration.
Vent valve
On vehicles fitted with a vent valve the fuel tank is vented from a pressure of 30 to 50 mbar, and air admitted at a vacuum of 1 to 16 mbar. In addition, this prevents overfilling the fuel tank.
as of MY 98
During refueling the fuel vapors are collected at the filler neck and passed to the activated charcoal filter (ORVR = Onboard Refueling Vapor Recovery). Large activated charcoal canister.
Engines with charging (compressor or turbocharger)
A check valve in the purge line prevents the boost pressure building up toward the activated charcoal canister.
Model 215 from chassis no. A046659 (ca. 23.3.05), without
and model 220 from chassis no. 469233 (ca. 23.3.05), without
with ski bag (code 282) or cool box in the rear backrest (code 308) or with retrofitted additional vent valve (76/1)
The additional vent valve (76/1) prevents vacuum reaching from the intake manifold over the activated charcoal canister to the fuel tank when purging is released. This closes the valve just as soon as a membrane has vacuum from the activated charcoal canister applied to it. If an overpressure or vacuum acts upon another connection on the valve then it opens immediately. This means that the aeration / venting of the fuel tank over standard vent valve (76) is still unrestricted.
Pay attention to installation position of vent valve (76/1). Check aeration at activated charcoal canister for dirt (e.g. dust, spider webs).
| ME-SFI control unit, location/task/design/ function | GF07.61-P-5000F | ||
| Coolant temperature sensor, location/task/ design/function | Engines 119, 120 | GF07.04-P-5026F | |
| Engines 104, 111 | GF07.04-P-5026G | ||
| Engine 112, 113, 137 | GF07.04-P-5026A | ||
| Purge control switchover valve, location/task/ design/function | GF47.30-P-4030L | ||
| Activated charcoal canister, location/task/ design/function | GF47.30-P-3102F | ||
| Vent valve, location/task/design/function | Models 129, 163, 170, 210, 215, 220, 230 except |
GF47.30-P-3101D | |
| Purge control valve actuation, function | GF07.61-P-3013F | ||
| Purge system function | GF47.30-P-3015J | ||
| Purge system with leak test function | Models 140, 163, 170, 203, 208, 209, 210, 211, 215, 220, 230 Model 129 as of 9/97 Model 202 as of 10/97 |
GF47.30-P-3016L | |
| On-board refueling vapor recovery function | Models 202, 203, 208, 209, 211, 230 Model 170 as of 9/00 Model 210.0 from 6/01 Models 215, 220 as of 9/00 |
GF47.10-P-3004B | |
Model 129 Model 170 up to 8/00 Model 210.2 Model 210.0 up to 5/01 Models 215, 220 up to 8/00 |
GF47.10-P-3004A |