{"id":2766,"date":"2023-11-14T22:46:14","date_gmt":"2023-11-14T21:46:14","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2766"},"modified":"2023-11-14T22:46:14","modified_gmt":"2023-11-14T21:46:14","slug":"fuel-evaporation-system","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/14\/fuel-evaporation-system\/","title":{"rendered":"Fuel evaporation system"},"content":{"rendered":"

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47\u2014800 Fuel evaporation system<\/strong><\/div>\n<\/div>\n<\/td>\n
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(T) <\/em>starting January 1973 up to production model<\/div>\n
year 1976 (@)1973, 1974 Federal<\/div>\n
High outside temperatures and self-heating of returning fuel will also heat fuel tank. Legislation in a number of countries does not permit these fuel evaporation vapors to escape into the atmosphere.<\/div>\n
For this reason, the fuels are drawn from fuel tank via crankcase breather into the combustion chambers when the engine is running, and they are stored in crankcase when the engine is stopped.<\/div>\n<\/div>\n<\/td>\n
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Model 114<\/strong><\/div>\n
From fuel tank, two lines are leading to expansion tank (capacity 4.5 I). The expansion tank is mounted at the right in trunk.<\/div>\n
Both lines serve as venting, overflow or discharge lines depending on position of fuel level in fuel tank, on fuel volume and on temperature.<\/div>\n
At the highest point of the expansion tank is the connection for the positive and negative venting line to valve system (2).<\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation control system comprises:<\/strong><\/div>\n<\/div>\n<\/td>\n
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Fuel expansion tank (1)<\/div>\n
Valve system (2)<\/div>\n
Fuel tank (3)<\/div>\n
Draw-off connection on crankcase (4)<\/div>\n<\/div>\n<\/td>\n
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Valve system<\/strong><\/div>\n<\/div>\n<\/td>\n
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The valve system is mounted underneath vehicle at level of rear legroom.<\/div>\n
The valve system comprises three valves:<\/div>\n
1.\u00a0 \u00a0Negative vent valve<\/div>\n
2.\u00a0 Pressure relief valve<\/div>\n
3.\u00a0 Positive vent valve<\/div>\n<\/div>\n<\/td>\n
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1 Protective box 3 Valve system<\/div>\n<\/div>\n<\/td>\n
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The negative vent valve <\/strong>(1)<\/strong> opens at slight over\u00adpressure. The evaporation vapors are flowing via a negative vent valve (1, direction B) into a line toward engine. The line enters into cylinder crankcase at connection point.<\/div>\n
The pressure relief valve <\/strong>(2) opens as a <\/em>safety valve in the event of overpressure in fuel evaporation system. The fuel vapors are bled directly into the open air.<\/div>\n
The positive vent valve <\/strong>(3) opens whenever cooling down of fuel tank results in a vacuum.<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Negative vent valve<\/div>\n
2\u00a0 \u00a0 Pressure relief valve<\/div>\n
3\u00a0 \u00a0 Positive vent valve<\/div>\n
A\u00a0 \u00a0To valve\/to expansion tank<\/div>\n
B\u00a0 \u00a0 To crankcase<\/div>\n
C\u00a0 \u00a0 Fresh air inlet<\/div>\n
D\u00a0 \u00a0Outlet pressure relief valve<\/div>\n<\/div>\n<\/td>\n
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47.2 lb-800\/2<\/div>\n<\/div>\n<\/td>\n
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Model 114 Fuel evaporation control system<\/div>\n
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1472-7781<\/strong><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/td>\n
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starting January 1973 up to production model year 1976 1973, 1974 Federal<\/div>\n<\/div>\n<\/td>\n
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11<\/div>\n
50 51 52 53 54<\/div>\n<\/div>\n<\/td>\n
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Hose clamp<\/div>\n
Fuel expansion tank<\/div>\n
Connecting pipe<\/div>\n
Fuel hose<\/div>\n
Negative venting line<\/div>\n
Valve system<\/div>\n<\/div>\n<\/td>\n
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555666<\/div>\n<\/div>\n<\/td>\n
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54a Cover 54b Filter 55 Negative vent line<\/div>\n
Connecting pipe<\/div>\n
Throttle<\/div>\n
Negative vent line<\/div>\n
Closing plug<\/div>\n
Ring fitting<\/div>\n
Sealing ring<\/div>\n
Hollow screw<\/div>\n<\/div>\n<\/td>\n
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47.2 lb-800\/3<\/div>\n<\/div>\n<\/td>\n
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\u00a3*> California 1974 and <\/strong>T) 1976<\/strong><\/div>\n<\/div>\n<\/td>\n
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A fuel evaporation control system has been installed to improve emissions which are not directly connected with engine combustion.<\/div>\n<\/div>\n<\/td>\n
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Components of fuel evaporation control system<\/strong><\/div>\n<\/div>\n<\/td>\n
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Valve <\/strong>system<\/div>\n
The valve system is mounted underneath vehicle in level of rear legroom.<\/div>\n
The valve system comprises three valves:<\/div>\n
1.\u00a0 Negative vent valve<\/div>\n
2.\u00a0 Pressure relief valve<\/div>\n
3.\u00a0 Positive vent valve\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 , Protective<\/sub> box<\/sub><\/div>\n
3 Valve system<\/div>\n<\/div>\n<\/td>\n
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The negative vent valve <\/strong>opens at a slight overpressure. The evaporation vapors are flowing via negative vent valve (1, direction B) into the line toward charcoal canister.<\/div>\n
The pressure relief valve <\/strong>opens as a safety valve in the event of an overpressure in fuel evaporation system. The fuel vapors are bled directly into the open air.<\/div>\n
The positive vent valve <\/strong>opens whenever cooling down of fuel tank results in a vacuum.<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 \u00a0Negative vent valve<\/div>\n
2\u00a0 \u00a0 Pressure relief valve<\/div>\n
3\u00a0 \u00a0 Positive vent valve<\/div>\n
A\u00a0 \u00a0To valve\/to expansion tank<\/div>\n
B\u00a0 \u00a0To charcoal canister<\/div>\n
C\u00a0 \u00a0 Fresh air inlet<\/div>\n
D\u00a0 \u00a0Outlet pressure relief valve<\/div>\n<\/div>\n<\/td>\n
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47.2 lb-800\/4<\/div>\n<\/div>\n<\/td>\n
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Charcoal canister<\/strong><\/div>\n
The fuel evaporation vapors from fuel tank and from float chamber are stored in charcoal canister and are drawn again out of canister when driving.<\/div>\n<\/div>\n<\/td>\n
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107-9131<\/div>\n<\/div>\n<\/td>\n
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A Tank vent connection<\/div>\n
B Draw-off valve connection<\/div>\n
C Float chamber-positive vent valve connection<\/div>\n<\/div>\n<\/td>\n
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Draw-off valve (purge valve)<\/strong><\/div>\n
The draw-off valve (purge valve) controls the volume of the fuel evaporation gases, which are drawn off by way of a connection in front of carburetor throttle valve depending on throttle valve position.<\/div>\n<\/div>\n<\/td>\n
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, 107-8974<\/div>\n<\/div>\n<\/td>\n
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Operation<\/strong><\/div>\n<\/div>\n<\/td>\n
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Function diagram<\/strong><\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Expansion tank<\/div>\n
2\u00a0 \u00a0 Valve system<\/div>\n
3\u00a0 \u00a0 Fuel tank<\/div>\n
4\u00a0 \u00a0 Intake pipe<\/div>\n
5\u00a0 \u00a0 Carburetor with positive vent valve<\/div>\n
6\u00a0 \u00a0 Charcoal canister<\/div>\n
7\u00a0 \u00a0 Draw-off valve (purge valve)<\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation gases from fuel tank and from float chamber of carburetor are stored in charcoal canister when the engine is stopped, and are drawn from charcoal canister when the engine is running, depending on intake pipe vacuum.<\/div>\n
The fuel evaporation vapors are routed directly into charcoal canister.<\/div>\n<\/div>\n<\/td>\n
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214 Float chamber positive vent valve<\/div>\n
219\u00a0 \u00a0 Vacuum connection<\/div>\n
220\u00a0 \u00a0 Negative vent connection<\/div>\n<\/div>\n<\/td>\n
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The fuel evaporation vapors from float chamber are flowing to charcoal canister only when the engine is stopped and the float chamber positive vent valve is open and are stored in charcoal canister.<\/div>\n<\/div>\n<\/td>\n
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507-10040,<\/div>\n<\/div>\n<\/div>\n<\/td>\n
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With the engine running, the switchover valve (37) is energized and the diaphragm of the float chamber positive vent valve is provided with a vacuum, the valve will close and interrupt the connection to char\u00adcoal canister.<\/div>\n<\/div>\n<\/td>\n
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In dependence of the throttle valve position of the I. stage of the carburetor the diaphragm of the draw-off valve (38) is provided with a vacuum, the valve opens.<\/div>\n
The intake pipe vacuum will draw the stored vapors from charcoal canister for burning.<\/div>\n<\/div>\n<\/td>\n
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38\u00a0 \u00a0Draw-off valve (purge valve)<\/div>\n
A\u00a0 \u00a0 Tank vent connection<\/div>\n
B\u00a0 \u00a0 \u00a0Draw-off valve connection<\/div>\n
C\u00a0 \u00a0 \u00a0Float chamber-positive vent valve connection<\/div>\n<\/div>\n<\/td>\n
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Fuel evaporation control system<\/strong><\/div>\n
\u00a9 1974 California, 1975\/76 Federal and California<\/strong><\/div>\n
CD 1976<\/div>\n<\/div>\n<\/td>\n
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13\u00a0 \u00a0 \u00a0Hose clamp<\/div>\n
38\u00a0 \u00a0 \u00a0Draw-off valve (purge valve)<\/div>\n
51\u00a0 \u00a0 \u00a0Fuel hose<\/div>\n
52\u00a0 \u00a0 \u00a0Negative vent line from fuel tank<\/div>\n
54\u00a0 \u00a0 \u00a0Fuel hose<\/div>\n
55\u00a0 \u00a0 \u00a0Valve system 55a\u00a0 \u00a0Cover<\/div>\n
55b\u00a0 \u00a0Filter<\/div>\n
56\u00a0 \u00a0 \u00a0Negative vent line<\/div>\n
64\u00a0 \u00a0 \u00a0Negative vent line<\/div>\n
65\u00a0 \u00a0 \u00a0Charcoal canister<\/div>\n
A\u00a0 \u00a0 \u00a0 Tank vent connection<\/div>\n
B\u00a0 \u00a0 \u00a0 \u00a0Draw-off valve connection<\/div>\n
C\u00a0 \u00a0 \u00a0 \u00a0Float chamber-positive vent valve connection<\/div>\n
D\u00a0 \u00a0 \u00a0 Vacuum line<\/div>\n
Arrow = draw-off connection carburetor<\/div>\n<\/div>\n<\/td>\n
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13%<\/strong><\/div>\n<\/div>\n<\/td>\n
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47.2 lb-800\/7<\/div>\n<\/div>\n<\/td>\n
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 <\/p>\n","protected":false},"excerpt":{"rendered":"

    47\u2014800 Fuel evaporation system   Note   (T) starting January 1973 up to production model year 1976 (@)1973, 1974 Federal High outside temperatures and self-heating of returning fuel will also heat fuel tank. Legislation in a number of countries does not permit these fuel evaporation vapors to escape into the atmosphere. For this reason, the fuels are drawn from fuel tank via crankcase breather into the combustion chambers when the engine is running, and they are stored in crankcase when the engine is stopped.   Model 114 From fuel tank, two lines are leading to expansion tank (capacity 4.5 I). The expansion tank is mounted at the right in trunk. Both lines serve as venting, overflow or discharge lines depending on position of fuel level in fuel tank, on fuel volume and on temperature. At the highest point of the expansion tank is the connection for the positive and negative venting line to valve system (2).   The fuel evaporation control system comprises:   Fuel expansion tank (1) Valve system (2) Fuel tank (3) Draw-off connection on crankcase (4)   47.2 lb-800\/1       Valve system The valve system is mounted underneath vehicle at level of rear legroom. The valve system comprises three valves: 1.\u00a0 \u00a0Negative vent valve 2.\u00a0 Pressure relief valve 3.\u00a0 Positive vent valve 1 Protective box 3 Valve system   The negative vent valve (1) opens at slight over\u00adpressure. The evaporation vapors are flowing via a negative vent valve (1, direction B) into a line toward engine. The line enters into cylinder crankcase at connection point. The pressure relief valve (2) opens as a safety valve in the event of overpressure in fuel evaporation system. The fuel vapors are bled directly into the open air. The positive vent valve (3) opens whenever cooling down of fuel tank results in a vacuum.   1\u00a0 \u00a0 Negative vent valve 2\u00a0 \u00a0 Pressure relief valve 3\u00a0 \u00a0 Positive vent valve A\u00a0 \u00a0To valve\/to expansion tank B\u00a0 \u00a0 To crankcase C\u00a0 \u00a0 Fresh air inlet D\u00a0 \u00a0Outlet pressure relief valve B   47.2 lb-800\/2       Model 114 Fuel evaporation control system 1472-7781   starting January 1973 up to production model year 1976 1973, 1974 Federal   11 50 51 52 53 54 Hose clamp Fuel expansion tank Connecting pipe Fuel hose Negative venting line Valve system   555666 54a Cover 54b Filter 55 Negative vent line Connecting pipe Throttle Negative vent line Closing plug Ring fitting Sealing ring Hollow screw     47.2 lb-800\/3       \u00a3*> California 1974 and T) 1976   A fuel evaporation control system has been installed to improve emissions which are not directly connected with engine combustion.   Components of fuel evaporation control system Valve system The valve system is mounted underneath vehicle in level of rear legroom. The valve system comprises three valves: 1.\u00a0 Negative vent valve 2.\u00a0 Pressure relief valve 3.\u00a0 Positive vent valve\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 , Protective box 3 Valve system   The negative vent valve opens at a slight overpressure. The evaporation vapors are flowing via negative vent valve (1, direction B) into the line toward charcoal canister. The pressure relief valve opens as a safety valve in the event of an overpressure in fuel evaporation system. The fuel vapors are bled directly into the open air. The positive vent valve opens whenever cooling down of fuel tank results in a vacuum.   1\u00a0 \u00a0 \u00a0Negative vent valve 2\u00a0 \u00a0 Pressure relief valve 3\u00a0 \u00a0 Positive vent valve A\u00a0 \u00a0To valve\/to expansion tank B\u00a0 \u00a0To charcoal canister C\u00a0 \u00a0 Fresh air inlet D\u00a0 \u00a0Outlet pressure relief valve   47.2 lb-800\/4       Charcoal canister The fuel evaporation vapors from fuel tank and from float chamber are stored in charcoal canister and are drawn again out of canister when driving. 107-9131 A Tank vent connection B Draw-off valve connection C Float chamber-positive vent valve connection   Draw-off valve (purge valve) The draw-off valve (purge valve) controls the volume of the fuel evaporation gases, which are drawn off by way of a connection in front of carburetor throttle valve depending on throttle valve position. 38   , 107-8974   Operation   Function diagram   1\u00a0 \u00a0 Expansion tank 2\u00a0 \u00a0 Valve system 3\u00a0 \u00a0 Fuel tank 4\u00a0 \u00a0 Intake pipe 5\u00a0 \u00a0 Carburetor with positive vent valve 6\u00a0 \u00a0 Charcoal canister 7\u00a0 \u00a0 Draw-off valve (purge valve)   The fuel evaporation gases from fuel tank and from float chamber of carburetor are stored in charcoal canister when the engine is stopped, and are drawn from charcoal canister when the engine is running, depending on intake pipe vacuum. The fuel evaporation vapors are routed directly into charcoal canister.   214 Float chamber positive vent valve 219\u00a0 \u00a0 Vacuum connection 220\u00a0 \u00a0 Negative vent connection 107-10093   47.2 lb-800\/5       The fuel evaporation vapors from float chamber are flowing to charcoal canister only when the engine is stopped and the float chamber positive vent valve is open and are stored in charcoal canister. 507-10040, With the engine running, the switchover valve (37) is energized and the diaphragm of the float chamber positive vent valve is provided with a vacuum, the valve will close and interrupt the connection to char\u00adcoal canister.   In dependence of the throttle valve position of the I. stage of the carburetor the diaphragm of the draw-off valve (38) is provided with a vacuum, the valve opens. The intake pipe vacuum will draw the stored vapors from charcoal canister for burning. 38\u00a0 \u00a0Draw-off valve (purge valve) A\u00a0 \u00a0 Tank vent connection B\u00a0 \u00a0 \u00a0Draw-off valve connection C\u00a0 \u00a0 \u00a0Float chamber-positive vent valve connection   47.2 lb-800\/6       Fuel evaporation control system \u00a9 1974 California, 1975\/76 Federal and California CD 1976   13\u00a0 \u00a0 \u00a0Hose clamp 38\u00a0 \u00a0 \u00a0Draw-off valve (purge valve) 51\u00a0 \u00a0 \u00a0Fuel hose 52\u00a0 \u00a0 \u00a0Negative vent line from fuel tank 54\u00a0 \u00a0 \u00a0Fuel hose 55\u00a0 \u00a0 \u00a0Valve system 55a\u00a0 \u00a0Cover 55b\u00a0 \u00a0Filter 56\u00a0 \u00a0 \u00a0Negative vent line 64\u00a0 \u00a0 \u00a0Negative vent line 65\u00a0 \u00a0 \u00a0Charcoal canister A\u00a0 \u00a0 \u00a0 Tank vent connection B\u00a0 \u00a0 \u00a0 \u00a0Draw-off valve connection C\u00a0 \u00a0 \u00a0 \u00a0Float chamber-positive vent valve connection D\u00a0 \u00a0 \u00a0 Vacuum line Arrow = draw-off connection carburetor 13%   47.2 lb-800\/7          <\/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-2766","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\/2766","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=2766"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2766\/revisions"}],"predecessor-version":[{"id":2767,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2766\/revisions\/2767"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2766"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2766"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}