{"id":2764,"date":"2023-11-14T22:45:03","date_gmt":"2023-11-14T21:45:03","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2764"},"modified":"2023-11-14T22:45:03","modified_gmt":"2023-11-14T21:45:03","slug":"fuel-evaporation-control-system","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/14\/fuel-evaporation-control-system\/","title":{"rendered":"Fuel evaporation control system"},"content":{"rendered":"

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47\u2014800 Fuel evaporation control system<\/strong><\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation control system which prevents the escape of evaporation vapors from fuel system into the atmosphere comprises the following components:<\/div>\n<\/div>\n<\/td>\n
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2\u00a0 \u00a0 Valve system<\/div>\n
3\u00a0 \u00a0 Fuel tank<\/div>\n
39 Charcoal canister<\/div>\n<\/div>\n<\/td>\n
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Valve system<\/strong><\/div>\n
The valve system is mounted underneath vehicle at level of rear legroom.<\/div>\n
The valve system comprises three valves:<\/div>\n
1.\u00a0 Pressure relief valve (negative vent valve)<\/div>\n
2.\u00a0 Safety valve<\/div>\n
3.\u00a0 Vacuum relief valve (positive vent valve)<\/div>\n
The pressure relief valve <\/strong>opens at a slight overpressure. The evaporation vapors will flow through pressure relief valve (1) (direction B) in a line toward charcoal canister.<\/div>\n<\/div>\n<\/td>\n
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The safety valve <\/strong>opens in the event of overpressure in fuel evaporation control system. The fuel vapors will be vented directly into the atmosphere.<\/div>\n
The vacuum relief valve <\/strong>opens in the event of a vacuum established when the fuel tank is cooling down.<\/div>\n
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1\u00a0 \u00a0 Pressure relief valve<\/div>\n
2\u00a0 \u00a0 Safety valve<\/div>\n
3\u00a0 \u00a0Vacuum relief valve<\/div>\n
A\u00a0 \u00a0To valve\/to expansion tank<\/div>\n
B\u00a0 \u00a0To charcoal canister<\/div>\n
C\u00a0 \u00a0Fresh air inlet<\/div>\n
D\u00a0 \u00a0Outlet safety valve<\/div>\n<\/div>\n<\/td>\n
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Charcoal canister<\/strong><\/div>\n
The fuel evaporation vapors from fuel tank are stored in charcoal canister and drawn off again while driving.<\/div>\n<\/div>\n<\/td>\n
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A Connection, fuel vapors from tank B Connection, throttle valve housing<\/div>\n<\/div>\n<\/td>\n
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Throttle valve housing<\/strong><\/div>\n
The throttle valve housing is provided with a connection for drawing evaporation vapors from char\u00adcoal canister.<\/div>\n<\/div>\n<\/td>\n
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107-13053<\/strong><\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 \u00a0Vacuum connection ignition retard<\/div>\n
2\u00a0 \u00a0 Vacuum connection ignition advance<\/div>\n
3\u00a0 \u00a0 Vacuum connection charcoal canister<\/div>\n<\/div>\n<\/td>\n
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The fuel tank with fuel expansion tank and the valve system correspond to the already known version.<\/div>\n<\/div>\n<\/td>\n
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Description of operation<\/strong><\/div>\n<\/div>\n<\/td>\n
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The fuel vapors from fuel tank are routed to charcoal canister via valve system (2). The fuel evaporation vapors are stored in charcoal canister when the engine is stopped and are drawn off into throttle valve housing when the engine is running as from a given throttle valve position.<\/div>\n
For checkup refer to: Exhaust gas test program<\/div>\n<\/div>\n<\/td>\n
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Arrow = Draw-off line to throttle valve housing<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/2 F2<\/div>\n<\/div>\n<\/td>\n
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(aus)(usa) 1978-1980 <\/strong>CD<\/strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1979\/80<\/strong><\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation control system has been completely revised to meet the new limits specified by law.<\/div>\n
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3\u00a0 \u00a0 Fuel tank<\/div>\n
4\u00a0 \u00a0Vent valve unit<\/div>\n
5\u00a0 \u00a0Purge valve<\/div>\n
39\u00a0 \u00a0Charcoal canister<\/div>\n<\/div>\n<\/td>\n
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The system comprises the following components: Fuel tank<\/strong><\/div>\n
The fuel tank with the tube system and the collecting tray are identical to the already known versions.<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Fuel tank<\/div>\n
2\u00a0 \u00a0 Immersion tube transmitter<\/div>\n
3\u00a0 \u00a0 Expansion tank<\/div>\n
4\u00a0 \u00a0 Connection vent valve unit<\/div>\n
5\u00a0 \u00a0 Tube system<\/div>\n
6\u00a0 \u00a0 Filler neck<\/div>\n
7\u00a0 \u00a0 Closing cover<\/div>\n<\/div>\n<\/td>\n
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8\u00a0 \u00a0Connection fuel feed line<\/div>\n
9\u00a0 \u00a0 Check vessels entering production starting 1979 (T) (model 123)<\/div>\n
starting 1980 (model 123) model 126 starting 1981<\/div>\n
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Vent valve unit<\/strong><\/div>\n<\/div>\n<\/td>\n
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The vent valve unit (67) is mounted underneath vehicle at level or rear legroom and replaces the valve system known from model year 1977.<\/div>\n
The unit comprises a pressure relief valve (negative vent valve) and a vacuum relief valve (positive vent valve).<\/div>\n<\/div>\n<\/td>\n
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Charcoal canister<\/strong><\/div>\n
The charcoal canister is identical with the already known version, except that the fastening bracket (arrows) has been modified.<\/div>\n<\/div>\n<\/td>\n
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A Draw-off line to throttle valve housing B Fuel tank vent line<\/div>\n<\/div>\n<\/td>\n
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Purge valve<\/strong><\/div>\n
The purge valve (66) is located in purge line from charcoal canister to throttle valve housing.<\/div>\n<\/div>\n<\/td>\n
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Throttle valve housing<\/strong><\/div>\n
In comparison to model year 1977 the throttle valve housing has been slightly modified. To prevent a mix-up of the vacuum lines, the outside diameter of the vacuum line to the charcoal canister has been in\u00adcreased from 4 to 5 mm. To purge the fuel vapors from the charcoal canister, two purge bores are pro\u00advided above the throttle valve.<\/div>\n<\/div>\n<\/td>\n
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2\u00a0 \u00a0 Vacuum connection, ignition advance<\/div>\n
3\u00a0 \u00a0 Vacuum connection, charcoal canister<\/div>\n<\/div>\n<\/td>\n
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Fuel tank cap<\/strong><\/div>\n
To avoid excessive pressure in fuel tank, the fuel tank cap has been modified.<\/div>\n<\/div>\n<\/td>\n
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1<\/strong>\u00a0 \u00a0 Fuel tank cap<\/strong><\/div>\n
2<\/strong>\u00a0 \u00a0 Gasket<\/strong><\/div>\n
3<\/strong>\u00a0 \u00a0 Locking tab<\/strong><\/div>\n
4<\/strong>\u00a0 \u00a0Compression spring<\/strong><\/div>\n
5<\/strong>\u00a0 \u00a0 Filler neck<\/strong><\/div>\n<\/div>\n<\/td>\n
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Description of operation<\/strong><\/div>\n<\/div>\n<\/td>\n
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Evaporation system<\/strong><\/div>\n
The pressure in fuel tank is increased to 30\u201450 mbar by means of the vent valve (67). This ensures that less fuel vapors can escape from tank.<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/4 F2<\/div>\n<\/div>\n<\/td>\n
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If a pressure of 30\u201450 mbar is reached in the fuel tank, the pressure relief valve (4) opens and permits the fuel vapors to travel to the charcoal canister, where they are stored if the engine is not running.<\/div>\n<\/div>\n<\/td>\n
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Vent valve unit, open to charcoal canister<\/div>\n
1\u00a0 \u00a0 Compression spring<\/div>\n
2\u00a0 \u00a0 Valve housing<\/div>\n
3\u00a0 \u00a0Spring seat<\/div>\n
4\u00a0 \u00a0Pressure relief valve<\/div>\n
5\u00a0 \u00a0Valve disk<\/div>\n
6\u00a0 \u00a0 Vacuum relief valve<\/div>\n
7\u00a0 \u00a0 Connection fitting<\/div>\n
A Connection, charcoal canister B Connection, fuel tank<\/div>\n<\/div>\n<\/td>\n
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When the fuel cools down, the decreasing volume is balanced by the intake of air or of fuel evaporation vapors from charcoal canister via vacuum relief valve (6) starting at a vacuum of 1 \u2014 16 mbar. If the vacuum in the fuel tank drops below 1 mbar, the vacuum relief valve (6) closes.<\/div>\n<\/div>\n<\/td>\n
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Vent valve unit, open to fuel tank<\/div>\n<\/div>\n<\/td>\n
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If the pressure in the fuel tank increases above 100\u2014300 mbar due to a malfunction in the fuel evaporation system, the fuel vapors can escape via the fuel filler cap.<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Fuel tank cap<\/div>\n
2\u00a0 \u00a0Sealing ring<\/div>\n
3\u00a0 \u00a0 Locking tab<\/div>\n
4\u00a0 \u00a0Compression spring<\/div>\n
5\u00a0 \u00a0 Filler neck<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/5 F2<\/div>\n<\/div>\n<\/td>\n
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Purge system<\/strong><\/div>\n<\/div>\n<\/td>\n
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The charcoal canister is connected with the throttle valve housing by a hose in which the purge valve is installed.<\/div>\n
When the engine is running and the vacuum in the purge line exceeds 30-50 mbar, the purge valve opens. The fuel vapors stored in the charcoal canister can be drawn into the throttle valve housing de\u00adpending on the throttle valve position.<\/div>\n<\/div>\n<\/td>\n
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Purge valve open<\/div>\n
1\u00a0 \u00a0 \u00a0Compression spring<\/div>\n
2\u00a0 \u00a0 Valve housing<\/div>\n
3\u00a0 \u00a0 Spring seat<\/div>\n
4\u00a0 \u00a0 Pressure relief valve<\/div>\n
5\u00a0 \u00a0 Valve disk<\/div>\n
6\u00a0 \u00a0 Connection fitting<\/div>\n
A\u00a0 \u00a0Connection, throttle valve housing<\/div>\n
B\u00a0 \u00a0 Connection, charcoal canister<\/div>\n<\/div>\n<\/td>\n
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As the throttle valve is opened, the two purge bores in the throttle valve housing, which terminate in a common passage, are progressively exposed to the venturi vacuum. This will result in a metered purging in the lower partial load operating range of the engine without influencing the driving characteristics.<\/div>\n<\/div>\n<\/td>\n
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Arrow = Draw-off connection of throttle valve<\/div>\n<\/div>\n<\/td>\n
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At idle and during coasting (throttle valve closed) both purge bores are located on the atmosphere side of the throttle valve. The purge valve is closed and, therefore, no purging of fuel vapors from the charcoal canister takes place.<\/div>\n<\/div>\n<\/td>\n
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1074-7731<\/strong><\/div>\n<\/div>\n<\/div>\n<\/td>\n
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Purge valve, closed<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/6 F2<\/div>\n<\/div>\n<\/td>\n
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starting 1981, <\/strong>(usa) 1981<\/strong><\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation control system has been revised in comparison to model year 1980. The purge system is controlled by means of a thermovalve and is effective only above approx. 50\u00b0C\/122\u00b0F coolant temperature.<\/div>\n<\/div>\n<\/td>\n
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Functional diagram<\/strong><\/div>\n<\/div>\n<\/td>\n
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37a\u00a0 \u00a0Thermovalve 50 C\/122 F<\/div>\n
50\u00a0 \u00a0 \u00a0Fuel tank<\/div>\n
51\u00a0 \u00a0 \u00a0 Vent valve unit<\/div>\n
52\u00a0 \u00a0 \u00a0Charcoal canister<\/div>\n
53\u00a0 \u00a0 \u00a0Purge valve<\/div>\n<\/div>\n<\/td>\n
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Components of fuel evaporation control system<\/strong><\/div>\n
Only the new components are shown here.<\/div>\n
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Thermovalve 50 \u00b0C\/122 \u00b0F (37a, color code red)<\/strong><\/div>\n
The thermovalve is installed in the sensor box on the cylinder head and opens at an engine cooling temperature of 50 \u00b0C\/122 \u00b0F.<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 \u00a0Bimetallic plate\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 A<\/div>\n
2\u00a0 \u00a0 O-ring\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 B<\/div>\n<\/div>\n<\/td>\n
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To purge valve<\/div>\n
To throttle valve housing<\/div>\n<\/div>\n<\/td>\n
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Purge valve (53, vacuum-controlled)<\/strong><\/div>\n
The purge valve is installed in the purge line from the charcoal canister to the throttle valve housing. It can be recognized by the vacuum connection to thermovalve 50 \u00b0C.<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/7 F 2<\/div>\n<\/div>\n<\/td>\n
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Description of operation<\/strong><\/div>\n<\/div>\n<\/td>\n
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Purge system<\/strong><\/div>\n
The charcoal canister is connected to the throttle valve housing by a line in which the purge valve is installed.<\/div>\n<\/div>\n<\/td>\n
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Purge valve closed<\/div>\n
A\u00a0 \u00a0Connection,charcoal canister<\/div>\n
B\u00a0 \u00a0 Connection, throttle valve housing<\/div>\n
C\u00a0 \u00a0 Vacuum connection<\/div>\n
1\u00a0 \u00a0 Compression spring<\/div>\n
4\u00a0 \u00a0 Diaphragm<\/div>\n<\/div>\n<\/td>\n
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When the engine is running at a coolant temperature above approx. 50 \u00b0C\/122 \u00b0F, intake manifold vacuum is applied to the purge valve through the thermovalve with the throttle valve slightly raised. The diaphragm (4) is pulled in upward direction against the spring force and connection from A to B is made.<\/div>\n<\/div>\n<\/td>\n
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When the throttle valve is opened still further, the two purge openings, which terminate in a common passage, are progressively exposed to the venturi vacuum. This will result in a metered purging in the lower partial load operating range of the engine without influencing the driving characteristics.<\/div>\n<\/div>\n<\/td>\n
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Purge valve, open<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/8 F2<\/div>\n<\/div>\n<\/td>\n
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Fuel evaporation control system<\/div>\n<\/div>\n<\/td>\n
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(aus) (us^) 1977 CD 1977\/78<\/div>\n<\/div>\n<\/td>\n
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13\u00a0 \u00a0 \u00a0 \u00a0 Hose clamp<\/div>\n
51\u00a0 \u00a0 \u00a0 \u00a0 Fuel hose<\/div>\n
52\u00a0 \u00a0 \u00a0 \u00a0Vent line from fuel tank<\/div>\n
54\u00a0 \u00a0 \u00a0 \u00a0 Fuel hose<\/div>\n
55\u00a0 \u00a0 \u00a0 \u00a0Valve system 55a\u00a0 \u00a0 \u00a0 Cover<\/div>\n
55b\u00a0 \u00a0 \u00a0Filter<\/div>\n
56\u00a0 \u00a0 \u00a0 \u00a0 Vent line<\/div>\n
64\u00a0 \u00a0 \u00a0 \u00a0Vent line<\/div>\n
65\u00a0 \u00a0 \u00a0 \u00a0Charcoal canister<\/div>\n
A\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Draw-off line to throttle valve housing<\/div>\n
B\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Fuel tank vent line<\/div>\n<\/div>\n<\/td>\n
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1978-1980 1979\/80<\/div>\n<\/div>\n<\/td>\n
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13<\/div>\n<\/div>\n<\/td>\n
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Hose clamp<\/div>\n<\/div>\n<\/td>\n
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51<\/div>\n<\/div>\n<\/td>\n
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Fuel hose<\/div>\n<\/div>\n<\/td>\n
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52<\/div>\n<\/div>\n<\/td>\n
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Vent line from fuel tank<\/div>\n<\/div>\n<\/td>\n
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54<\/div>\n<\/div>\n<\/td>\n
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Fuel hose<\/div>\n<\/div>\n<\/td>\n
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56<\/div>\n<\/div>\n<\/td>\n
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Vent line<\/div>\n<\/div>\n<\/td>\n
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64<\/div>\n<\/div>\n<\/td>\n
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Vent line<\/div>\n<\/div>\n<\/td>\n
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65<\/div>\n<\/div>\n<\/td>\n
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Charcoal canister<\/div>\n<\/div>\n<\/td>\n
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66<\/div>\n<\/div>\n<\/td>\n
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Purge valve<\/div>\n<\/div>\n<\/td>\n
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67<\/div>\n<\/div>\n<\/td>\n
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Vent valve unit<\/div>\n<\/div>\n<\/td>\n
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a<\/div>\n<\/div>\n<\/td>\n
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To throttle valve housing<\/div>\n<\/div>\n<\/td>\n
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A<\/div>\n<\/div>\n<\/td>\n
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Draw-off line to purge valve<\/div>\n<\/div>\n<\/td>\n
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B<\/div>\n<\/div>\n<\/td>\n
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Fuel tank vent line<\/div>\n<\/div>\n<\/td>\n
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47.2llb-800\/9 F2<\/div>\n<\/div>\n<\/td>\n
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51\u00a0 \u00a0 \u00a0Vent valve<\/div>\n
52\u00a0 \u00a0 \u00a0Charcoal canister<\/div>\n
53\u00a0 \u00a0 \u00a0Purge valve<\/div>\n
53a\u00a0 \u00a0Draw-off line to throttle valve<\/div>\n
53b\u00a0 \u00a0Vacuum line<\/div>\n
64\u00a0 \u00a0 \u00a0Vent line from fuel tank<\/div>\n
64a\u00a0 \u00a0Vent line to charcoal canister<\/div>\n<\/div>\n<\/td>\n
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A\u00a0 \u00a0To purge valve<\/div>\n
B\u00a0 \u00a0 To fuel tank<\/div>\n
C\u00a0 \u00a0 Hose clamp<\/div>\n
D\u00a0 \u00a0Clamp<\/div>\n<\/div>\n<\/td>\n
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Color code sw = black vi = purple ws = white<\/div>\n<\/div>\n<\/td>\n
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47.2 llb-800\/10 F2<\/strong><\/div>\n<\/div>\n<\/td>\n
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 <\/p>\n","protected":false},"excerpt":{"rendered":"

    47\u2014800 Fuel evaporation control system     The fuel evaporation control system which prevents the escape of evaporation vapors from fuel system into the atmosphere comprises the following components:   2\u00a0 \u00a0 Valve system 3\u00a0 \u00a0 Fuel tank 39 Charcoal canister   Valve system The valve system is mounted underneath vehicle at level of rear legroom. The valve system comprises three valves: 1.\u00a0 Pressure relief valve (negative vent valve) 2.\u00a0 Safety valve 3.\u00a0 Vacuum relief valve (positive vent valve) The pressure relief valve opens at a slight overpressure. The evaporation vapors will flow through pressure relief valve (1) (direction B) in a line toward charcoal canister.   The safety valve opens in the event of overpressure in fuel evaporation control system. The fuel vapors will be vented directly into the atmosphere. The vacuum relief valve opens in the event of a vacuum established when the fuel tank is cooling down.   1\u00a0 \u00a0 Pressure relief valve 2\u00a0 \u00a0 Safety valve 3\u00a0 \u00a0Vacuum relief valve A\u00a0 \u00a0To valve\/to expansion tank B\u00a0 \u00a0To charcoal canister C\u00a0 \u00a0Fresh air inlet D\u00a0 \u00a0Outlet safety valve   47.2 lib\u2014800\/1 F 2       Charcoal canister The fuel evaporation vapors from fuel tank are stored in charcoal canister and drawn off again while driving. 107-9128 A Connection, fuel vapors from tank B Connection, throttle valve housing   Throttle valve housing The throttle valve housing is provided with a connection for drawing evaporation vapors from char\u00adcoal canister. 107-13053 1\u00a0 \u00a0 \u00a0Vacuum connection ignition retard 2\u00a0 \u00a0 Vacuum connection ignition advance 3\u00a0 \u00a0 Vacuum connection charcoal canister   The fuel tank with fuel expansion tank and the valve system correspond to the already known version.   Description of operation The fuel vapors from fuel tank are routed to charcoal canister via valve system (2). The fuel evaporation vapors are stored in charcoal canister when the engine is stopped and are drawn off into throttle valve housing when the engine is running as from a given throttle valve position. For checkup refer to: Exhaust gas test program Arrow = Draw-off line to throttle valve housing   47.2 llb-800\/2 F2       (aus)(usa) 1978-1980 CD\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1979\/80   The fuel evaporation control system has been completely revised to meet the new limits specified by law.   3\u00a0 \u00a0 Fuel tank 4\u00a0 \u00a0Vent valve unit 5\u00a0 \u00a0Purge valve 39\u00a0 \u00a0Charcoal canister   The system comprises the following components: Fuel tank The fuel tank with the tube system and the collecting tray are identical to the already known versions. 1\u00a0 \u00a0 Fuel tank 2\u00a0 \u00a0 Immersion tube transmitter 3\u00a0 \u00a0 Expansion tank 4\u00a0 \u00a0 Connection vent valve unit 5\u00a0 \u00a0 Tube system 6\u00a0 \u00a0 Filler neck 7\u00a0 \u00a0 Closing cover 8\u00a0 \u00a0Connection fuel feed line 9\u00a0 \u00a0 Check vessels entering production starting 1979 (T) (model 123) starting 1980 (model 123) model 126 starting 1981   Vent valve unit The vent valve unit (67) is mounted underneath vehicle at level or rear legroom and replaces the valve system known from model year 1977. The unit comprises a pressure relief valve (negative vent valve) and a vacuum relief valve (positive vent valve).   Charcoal canister The charcoal canister is identical with the already known version, except that the fastening bracket (arrows) has been modified. A Draw-off line to throttle valve housing B Fuel tank vent line   47.2 llb-800\/3 F 2       Purge valve The purge valve (66) is located in purge line from charcoal canister to throttle valve housing.   Throttle valve housing In comparison to model year 1977 the throttle valve housing has been slightly modified. To prevent a mix-up of the vacuum lines, the outside diameter of the vacuum line to the charcoal canister has been in\u00adcreased from 4 to 5 mm. To purge the fuel vapors from the charcoal canister, two purge bores are pro\u00advided above the throttle valve.   2\u00a0 \u00a0 Vacuum connection, ignition advance 3\u00a0 \u00a0 Vacuum connection, charcoal canister   Fuel tank cap To avoid excessive pressure in fuel tank, the fuel tank cap has been modified. 1\u00a0 \u00a0 Fuel tank cap 2\u00a0 \u00a0 Gasket 3\u00a0 \u00a0 Locking tab 4\u00a0 \u00a0Compression spring 5\u00a0 \u00a0 Filler neck   Description of operation   Evaporation system The pressure in fuel tank is increased to 30\u201450 mbar by means of the vent valve (67). This ensures that less fuel vapors can escape from tank.   47.2 llb-800\/4 F2       If a pressure of 30\u201450 mbar is reached in the fuel tank, the pressure relief valve (4) opens and permits the fuel vapors to travel to the charcoal canister, where they are stored if the engine is not running. Vent valve unit, open to charcoal canister 1\u00a0 \u00a0 Compression spring 2\u00a0 \u00a0 Valve housing 3\u00a0 \u00a0Spring seat 4\u00a0 \u00a0Pressure relief valve 5\u00a0 \u00a0Valve disk 6\u00a0 \u00a0 Vacuum relief valve 7\u00a0 \u00a0 Connection fitting A Connection, charcoal canister B Connection, fuel tank   When the fuel cools down, the decreasing volume is balanced by the intake of air or of fuel evaporation vapors from charcoal canister via vacuum relief valve (6) starting at a vacuum of 1 \u2014 16 mbar. If the vacuum in the fuel tank drops below 1 mbar, the vacuum relief valve (6) closes. Vent valve unit, open to fuel tank   If the pressure in the fuel tank increases above 100\u2014300 mbar due to a malfunction in the fuel evaporation system, the fuel vapors can escape via the fuel filler cap. 1\u00a0 \u00a0 Fuel tank cap 2\u00a0 \u00a0Sealing ring 3\u00a0 \u00a0 Locking tab 4\u00a0 \u00a0Compression spring 5\u00a0 \u00a0 Filler neck   47.2 llb-800\/5 F2       Purge system   The charcoal canister is connected with the throttle valve housing by a hose in which the purge valve is installed. When the engine is running and the vacuum in the purge line exceeds 30-50 mbar, the purge valve opens. The fuel vapors stored in the charcoal canister can be drawn into the throttle valve housing de\u00adpending on the throttle valve position. Purge valve open 1\u00a0 \u00a0 \u00a0Compression spring 2\u00a0 \u00a0 Valve housing 3\u00a0 \u00a0 Spring seat 4\u00a0 \u00a0 Pressure relief valve 5\u00a0 \u00a0 Valve disk 6\u00a0 \u00a0 Connection fitting A\u00a0 \u00a0Connection, throttle valve housing B\u00a0 \u00a0 Connection, charcoal canister   As the throttle valve is opened, the two purge bores in the throttle valve housing, which terminate in a common passage, are progressively exposed to the venturi vacuum. This will result in a metered purging in the lower partial load operating range of the engine without influencing the driving characteristics. Arrow = Draw-off connection of throttle valve   At idle and during coasting (throttle valve closed) both purge bores are located on the atmosphere side of the throttle valve. The purge valve is closed and, therefore, no purging of fuel vapors from the charcoal canister takes place. 1074-7731   Purge valve, closed   47.2 llb-800\/6 F2       starting 1981, (usa) 1981   The fuel evaporation control system has been revised in comparison to model year 1980. The purge system is controlled by means of a thermovalve and is effective only above approx. 50\u00b0C\/122\u00b0F coolant temperature.   Functional diagram   37a\u00a0 \u00a0Thermovalve 50 C\/122 F 50\u00a0 \u00a0 \u00a0Fuel tank 51\u00a0 \u00a0 \u00a0 Vent valve unit 52\u00a0 \u00a0 \u00a0Charcoal canister 53\u00a0 \u00a0 \u00a0Purge valve   Components of fuel evaporation control system Only the new components are shown here.   Thermovalve 50 \u00b0C\/122 \u00b0F (37a, color code red) The thermovalve is installed in the sensor box on the cylinder head and opens at an engine cooling temperature of 50 \u00b0C\/122 \u00b0F. 1\u00a0 \u00a0 \u00a0Bimetallic plate\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 A 2\u00a0 \u00a0 O-ring\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 B To purge valve To throttle valve housing   Purge valve (53, vacuum-controlled) The purge valve is installed in the purge line from the charcoal canister to the throttle valve housing. It can be recognized by the vacuum connection to thermovalve 50 \u00b0C.   47.2 llb-800\/7 F 2       Description of operation Purge system The charcoal canister is connected to the throttle valve housing by a line in which the purge valve is installed. Purge valve closed A\u00a0 \u00a0Connection,charcoal canister B\u00a0 \u00a0 Connection, throttle valve housing C\u00a0 \u00a0 Vacuum connection 1\u00a0 \u00a0 Compression spring 4\u00a0 \u00a0 Diaphragm   When the engine is running at a coolant temperature above approx. 50 \u00b0C\/122 \u00b0F, intake manifold vacuum is applied to the purge valve through the thermovalve with the throttle valve slightly raised. The diaphragm (4) is pulled in upward direction against the spring force and connection from A to B is made.   When the throttle valve is opened still further, the two purge openings, which terminate in a common passage, are progressively exposed to the venturi vacuum. This will result in a metered purging in the lower partial load operating range of the engine without influencing the driving characteristics. Purge valve, open   47.2 llb-800\/8 F2       Fuel evaporation control system   (aus) (us^) 1977 CD 1977\/78 13\u00a0 \u00a0 \u00a0 \u00a0 Hose clamp 51\u00a0 \u00a0 \u00a0 \u00a0 Fuel hose 52\u00a0 \u00a0 \u00a0 \u00a0Vent line from fuel tank 54\u00a0 \u00a0 \u00a0 \u00a0 Fuel hose 55\u00a0 \u00a0 \u00a0 \u00a0Valve system 55a\u00a0 \u00a0 \u00a0 Cover 55b\u00a0 \u00a0 \u00a0Filter 56\u00a0 \u00a0 \u00a0 \u00a0 Vent line 64\u00a0 \u00a0 \u00a0 \u00a0Vent line 65\u00a0 \u00a0 \u00a0 \u00a0Charcoal canister A\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Draw-off line to throttle valve housing B\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Fuel tank vent line   1978-1980 1979\/80 13 Hose clamp 51 Fuel hose 52 Vent line from fuel tank 54 Fuel hose 56 Vent line 64 Vent line 65 Charcoal canister 66 Purge valve 67 Vent valve unit a To throttle valve housing A Draw-off line to purge valve B Fuel tank vent line   47.2llb-800\/9 F2           51\u00a0 \u00a0 \u00a0Vent valve 52\u00a0 \u00a0 \u00a0Charcoal canister 53\u00a0 \u00a0 \u00a0Purge valve 53a\u00a0 \u00a0Draw-off line to throttle valve 53b\u00a0 \u00a0Vacuum line 64\u00a0 \u00a0 \u00a0Vent line from fuel tank 64a\u00a0 \u00a0Vent line to charcoal canister A\u00a0 \u00a0To purge valve B\u00a0 \u00a0 To fuel tank C\u00a0 \u00a0 Hose clamp D\u00a0 \u00a0Clamp Color code sw = black vi = purple ws = white   47.2 llb-800\/10 F2        <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[27,43],"tags":[],"class_list":["post-2764","post","type-post","status-publish","format-standard","hentry","category-m110","category-m110-fuel-system"],"aioseo_notices":[],"featured_image_src":null,"author_info":{"display_name":"mackuz","author_link":"https:\/\/mbci.mackuz.ovh\/index.php\/author\/mackuz\/"},"_links":{"self":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/comments?post=2764"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2764\/revisions"}],"predecessor-version":[{"id":2765,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2764\/revisions\/2765"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}