US3610221A - Fuel tank purge system and method - Google Patents
Fuel tank purge system and method Download PDFInfo
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- US3610221A US3610221A US863955A US3610221DA US3610221A US 3610221 A US3610221 A US 3610221A US 863955 A US863955 A US 863955A US 3610221D A US3610221D A US 3610221DA US 3610221 A US3610221 A US 3610221A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
Definitions
- This invention relates to a pressure fuel tank purge system and method for use with engines utilizing fuel such as gasoline and, more particularly, to a system and method for containing and subsequently consuming hydrocarbon vapor from the fuel tank of an internal combustion engine.
- the principal object of this invention to improve fuel tank purge systems whereby fuel vapor stored in the fuel tank can be purged from it during engine operation and conveyed to the engine for consumption therein without affecting the air-fuel ratio of the engine at the particular operating condition at which the fuel vapor is introduced into the engme.
- Another object of this-invention is to provide a vapor purge system which will maintain during engine operation, metering results in the carburetor which will be the same when handling liquid fuel as when handling liquid fuel and fuel vapor.
- Another object of this invention is to provide an improved method of purging hydrocarbon vapors from a fuel tank whereby the fuel vapor is admixed with liquid fuel without affecting the air-fuel ratio for the engine at a given operating condition.
- Still another object of this invention is to improve a fuel tank purge system and method for the purging of fuel vapors whereby this purging will not affect engine performance and will not increase exhaust emission.
- FIG. 1 is a schematic view of a portion of an engine fue system incorporating a fuel tank purge system with a carburetor compensated idle system in accordance with the invention.
- FIG. 2 is a schematic view similar to FIG. 1, but incorporating a second embodiment of a carburetor compensated idle system.
- a conventional'carburetor is indicated at 10 and is adapted to be mounted on an engine intake manifold of an internal combustion engine, not shown, to which the carburetor supplies a suitable fuel-air mixture.
- Carburetor 10 includes air horn 12, a throttle valve 14, a fuel bowl l6 and well 18, the fuel bowl being supplied with fuel from a conduit 20.
- the quantity of fuel flow to bowl 16 is controlled in the normal manner by a float control inlet valve, not shown.
- a fuel pump 22 supplies fuel to conduit 20 and in turn draws fuel from a fueltank 26 through a conduit 24.
- Fuel reservoir or tank 26 is adapted to be filled through a filler pipe 28 normally closed by a cap 30 and would normally contain a quantity of liquid fuel 32 with the space above the fuel level containing fuel vapors 34.
- the cap 30 is a nonvented cap and in order to discharge the vapor from the tank, the vapor space of the fuel tank 26 is connected to the idle fuel system of the carburetor 10.
- the idle system of a conventional carburetor includes an idle tube 40 having an orifice 42 at the lower end thereof positioned in the fuel bowl well with the orifice below the normal fuel level in the well.
- the idle tube 40 is connected intermediate its ends via passage 44 to an idle air-bleed 46 which in turn is in communication via idle restriction passage 48 with a second or lower idle air-bleed 50 and idle passage 52.
- Discharge of an air-fuel mixture from the idle passage 52 is through adjustable idle mixture needle 54, controlled idle port 56 posterior to the throttle valve in the throat of the carburetor when closed and through off-idle port 58 anterior thereof.
- fuel vapor is delivered into the idle system through a mctering'orifice 60 into the top of idle tube 40 which is connected via conduit 62, pressure regulator 64, conduit 66, valve 68 and conduit 70 to the fuel tank 26.
- a vacuum relief valve 72 and a pressure relief valve 74 are operatively connected to the fuel tank, as by conduit 70 to permit breathing and to control the maximum pressure in the fuel tank.
- Pressure regulator 64 is provided to prevent flow in the conduit 66 when the tank pressure is at or below atmospheric pressure.
- Pressure relief valve 74 is set to open at a pressure within safe limits of the fuel tank structure.
- Valve 68 which can be of any suitable type, such as an engine oil pressure diaphragm activated valve, is shown herein as a solenoid valve, normally closed, which is connected by a suitable switch, such as an ignition switch, to a source of electrical power, not shown, so that it can be energized upon the start of engine operation.
- a suitable switch such as an ignition switch
- the carburetor is calibrated to the optimum air-fuel ratio for the engine, with the valve 68 closed, in the normal manner. Then, after calibration, the system can be used to purge fuel vapors from the fuel tank when the engine is in operation, at which time valve 68 is open through the circuit, previously described. Feeding I00 percent vaporized fuel to metering orifice 60 causes the previously calibrated idle tube 40 suction to vary as a direct function of the vapor-flow rate by weight. The increasing flow progressively reduces the idle tube 40 liquid delivery to zero at which time the weight of fuel vapors through the metering orifice 60 and then to the idle ports 56, 58 will equal the original idle tube liquid calibration. When the fuel vapor pressure in the fuel tank decreases to atmospheric pressure, the pressure regulator valve 64 will close so that the carburetor does not bleed air and hence lean out.
- conduit 62 is connected via metering orifice 60 to the upper end of idle passage 52 to inject the fuel vapor downstream of the metering area of the idle fuel system of the carburetor, but above off-idle port 58.
- the metering orifice or bleed 60a at the top of idle tube 40 is in communication with air horn 12 via conduit 61. This arrangement provides the best vapor compensation with the liquid fuel rate decreasing in a linear fashion as the amount of vapor entering the idle system increases.
- a method of storing and then recovering fuel vapor from the normally nonvented fuel tank of an engine and venting the thus stored fuel vapor through the idle system of the carburetor of the engine comprising the steps of storing substantially all of the fuel vapor released from liquid fuel in the fuel tank under pressure in said fuel tank when the engine is not operating, releasing the stored fuel vapor under pressure during engine operation, conveying the released fuel vapor at above atmospheric pressure to the idle system of the carburetor during engine operation, admixing the fuel vapor with liquid fuel and aeriform fluid in the idle system of the carburetor to provide a predetermined air-fuel ratio, maintaining this air-fuel ratio by decreasing the quantity of liquid fuel in direct relation to the amount of fuel vapor conveyed into the idle system of the carburetor, and discharging the resulting air-fuel mixture from the idle port and off-idle port of the carburetor.
- a fuel tank purge system for an internal combustion engine having a carburetor with an idle system including an idle tube connected to an idle air-bleed passage and in communication through an idle restriction with a lower idle air-bleed passage and through an idle passage to an idle port and off-idle port of said carburetor, and a pressure fuel reservoir, the systemcomprising valve-controlled conduit means connected to said pressure fuel reservoir in fuel vapor flow relation thereto and, metering orifice passage means connecting said conduit means to said idle system of said carburetor upstream in terms of the direction of flow of said idle port and said offidle port, said valve-controlled means including valve means to block fuel vapor flow to said idle system when the engine is not in operation and a pressure regulator valve adapted to block fuel vapor flow to said idle system when the pressure in said pressure fuel reservoir reaches atmospheric pressure.
- a fuel tank purge system according to claim'2 wherein said metering orifice passage means is connected to said idle tube of said idle system.
- a fuel tankpurge system according to claim 2 wherein said metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
- valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
- a fuel tank purge system for an internal combustion engine having a pressure fuel tank and a carburetor with an idle system including an idle tube connected to idle-bleed passages and in communication through an idle restriction and an idle passage with an idle port and an off-idle port of said carburetor, said system comprising a vapor metering orifice passage means positioned in communication with the idle system of the carburetor upstream of the idle rt and off-idle port of said carburetor, and valve-controlle conduit means, including a pressure regulator valve, and a control-valve,'said valvecontrolled conduit means being connected at one end to the pressure fuel tank in vapor flow relation thereto and at its other end to said vapor metering orifice passage means, said pressure regulator valve being adapted to block fuel vapor flow to the idle system when the pressure in the pressure fuel reservoir reaches atmospheric pressure, said control valve being operable to block the flow of fuel vapor to said idle system of said carburetor when the engine is not in operation and operable during engine operation to
- a fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle tube of said idle system.
- a fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
- valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
A fuel tank purge system and method in which fuel vapor stored in a nonvented fuel tank is released and conveyed to a vapor compensated idle system of a carburetor whereby the air-fuel mixture ratio at idle and off-idle will be the same curve whether fuel is coming from the carburetor bowl as liquid fuel or whether a portion of the fuel is coming from the fuel tank as fuel vapor.
Description
United States Patent lnventor Donald D. Stoltman Henrietta, N.Y.
Appl. No. 863,955
Filed Oct. 6, 1969 Patented Oct. 5, 1971 Assignee General Motors Corporation Detroit, Mich.
FUEL TANK PURGE SYSTEM AND METHOD 9 Claims, 2 Drawing Figs.
US. Cl 123/136, 123/121,123/119 Int. Cl ..F02m21/0 F02m 13/08 Field of Search 123/136,
[56] References Cited UNITED STATES PATENTS 2,933,894 4/1960 Johnson et al. 60/3928 3,191,587 6/1965 Hall 123/136 Primary ExaminerMark M. Newman Assistant Examiner-Cort Flint AttorneysJean L. Carpenter and Arthur N. Krein ABSTRACT: A fuel tank purge system and method in which fuel vapor stored in a nonvented fuel tank is released and conveyed to a vapor compensated idle system of a carburetor whereby the air-fuel mixture ratio at idle and off-idle will be the same curve whether fuel is coming from the carburetor bowl as liquid fuel or whether a portion of the fuel is coming from the fuel tank as fuel vapor.
PATENTED um 519m awed! Q Sak /6121411 ATTORNEY FUEL TANK PURGE SYSTEM AND METHOD This invention relates to a pressure fuel tank purge system and method for use with engines utilizing fuel such as gasoline and, more particularly, to a system and method for containing and subsequently consuming hydrocarbon vapor from the fuel tank of an internal combustion engine. v
It is well known that vapors and gasses emitted from internal combustion engines contribute to the present day problem of air pollution. Accordingly, much attention has been directed to controlling the polluting emissions from internal combustion engines; Many corrective devices have been proposed and utilized to control the most obvious source of emission, that is, of fumes from the engine exhaust and crankcase. Another source of hydrocarbon emission from an internal combustion engine is the fuel vapor or hydrocarbons escaping from the fuel system. In particular, gas vapors may escape from the external vents of both the fuel tank and the carburetor float bowl, either while driving or while at rest. It has been estimated that of this uncontrolled fuel evaporation losses, the loss from the fuel tank accounts for from 50 percent to approximately 75 percent of this total loss. In an effort to reduce the hydrocarbon emission from the fuel system, various evaporative loss control devices have been proposed and utilized whereby, the fuel vapors are contained and then delivered to the intake manifold of the engine while in operation for consumption therein. This approach has worked successfully to help reduce the hydrocarbon emission directly from the fuel system but, under certain engine operating conditions, this feedback of the hydrocarbon vapors for consumption in the engine has affected engine operation or has increased the exhaust emission of unburned hydrocarbon or both. 1
It is, therefore, the principal object of this invention to improve fuel tank purge systems whereby fuel vapor stored in the fuel tank can be purged from it during engine operation and conveyed to the engine for consumption therein without affecting the air-fuel ratio of the engine at the particular operating condition at which the fuel vapor is introduced into the engme.
Another object of this-invention is to provide a vapor purge system which will maintain during engine operation, metering results in the carburetor which will be the same when handling liquid fuel as when handling liquid fuel and fuel vapor.
Another object of this invention is to provide an improved method of purging hydrocarbon vapors from a fuel tank whereby the fuel vapor is admixed with liquid fuel without affecting the air-fuel ratio for the engine at a given operating condition.
Still another object of this invention is to improve a fuel tank purge system and method for the purging of fuel vapors whereby this purging will not affect engine performance and will not increase exhaust emission.
These and other objects of the invention are obtained by means of a fuel tank purge system and method for an internal combustion engine wherein fuel vapor is stored in a nonvented fuel tank which is connected by a valve controlled conduit for the fuel vapor to the idle system of a carburetor, the idle system being calibrated to compensate for the introduction of fuel vapor so that the mixture ratio at idle and off-idle will be the same curve whether fuel is coming totally from the carburetor bowl as liquid fuel or whether a portion of the fuel is coming from the fuel tank as fuel vapor.
For a better understanding of the invention, as well as other objects and further features thereof, reference is had to the following detailed description of the invention to be read in connection with the accompanying drawings, wherein:
FIG. 1 is a schematic view of a portion of an engine fue system incorporating a fuel tank purge system with a carburetor compensated idle system in accordance with the invention; and
FIG. 2 is a schematic view similar to FIG. 1, but incorporating a second embodiment of a carburetor compensated idle system.
Referring to the drawings, a conventional'carburetor is indicated at 10 and is adapted to be mounted on an engine intake manifold of an internal combustion engine, not shown, to which the carburetor supplies a suitable fuel-air mixture. Carburetor 10 includes air horn 12, a throttle valve 14, a fuel bowl l6 and well 18, the fuel bowl being supplied with fuel from a conduit 20. The quantity of fuel flow to bowl 16 is controlled in the normal manner by a float control inlet valve, not shown. A fuel pump 22 supplies fuel to conduit 20 and in turn draws fuel from a fueltank 26 through a conduit 24.. Fuel reservoir or tank 26 is adapted to be filled through a filler pipe 28 normally closed by a cap 30 and would normally contain a quantity of liquid fuel 32 with the space above the fuel level containing fuel vapors 34.
Rather than venting this fuel vapor from the fuel tank to the atmosphere through a suitable vent, such as a vented fuel tank cap as was done in the prior art, the cap 30 is a nonvented cap and in order to discharge the vapor from the tank, the vapor space of the fuel tank 26 is connected to the idle fuel system of the carburetor 10.
As is well known, the idle system of a conventional carburetor includes an idle tube 40 having an orifice 42 at the lower end thereof positioned in the fuel bowl well with the orifice below the normal fuel level in the well. The idle tube 40 is connected intermediate its ends via passage 44 to an idle air-bleed 46 which in turn is in communication via idle restriction passage 48 with a second or lower idle air-bleed 50 and idle passage 52. Discharge of an air-fuel mixture from the idle passage 52 is through adjustable idle mixture needle 54, controlled idle port 56 posterior to the throttle valve in the throat of the carburetor when closed and through off-idle port 58 anterior thereof.
In the embodiment illustrated in FIG. 1, fuel vapor is delivered into the idle system through a mctering'orifice 60 into the top of idle tube 40 which is connected via conduit 62, pressure regulator 64, conduit 66, valve 68 and conduit 70 to the fuel tank 26. A vacuum relief valve 72 and a pressure relief valve 74 are operatively connected to the fuel tank, as by conduit 70 to permit breathing and to control the maximum pressure in the fuel tank. Pressure regulator 64 is provided to prevent flow in the conduit 66 when the tank pressure is at or below atmospheric pressure. Pressure relief valve 74 is set to open at a pressure within safe limits of the fuel tank structure. Valve 68, which can be of any suitable type, such as an engine oil pressure diaphragm activated valve, is shown herein as a solenoid valve, normally closed, which is connected by a suitable switch, such as an ignition switch, to a source of electrical power, not shown, so that it can be energized upon the start of engine operation.
In operation, the carburetor is calibrated to the optimum air-fuel ratio for the engine, with the valve 68 closed, in the normal manner. Then, after calibration, the system can be used to purge fuel vapors from the fuel tank when the engine is in operation, at which time valve 68 is open through the circuit, previously described. Feeding I00 percent vaporized fuel to metering orifice 60 causes the previously calibrated idle tube 40 suction to vary as a direct function of the vapor-flow rate by weight. The increasing flow progressively reduces the idle tube 40 liquid delivery to zero at which time the weight of fuel vapors through the metering orifice 60 and then to the idle ports 56, 58 will equal the original idle tube liquid calibration. When the fuel vapor pressure in the fuel tank decreases to atmospheric pressure, the pressure regulator valve 64 will close so that the carburetor does not bleed air and hence lean out.
In an actual test, a commercially available 283 CID Chevrolet two-barrel carburetor manufactured during the 1967 model year by Rochester Products Division of General Motors Corporation was reworked to inject fuel vapors into the top idle bleeds of the carburetor. No changes other then eliminating the top bleeds were made in the carburetor. Airfuel ratio for various metering orifice sizes, and vapor inlet pressures were detennined, at idle, by exhaust analysis. Using these particular. sized metering orifices, of 0.025-inch restriction, 0.030-inch restriction, 0.035-inch restriction and 0.046- inch restriction, the test indicated that with tank pressure up to 4 pounds per square inch there was a slight increase in the air-fuel ratio over that previously calibrated, but this was insufficient to affect idle and off-idle operation of the engine and, of course, with this slight increase in the air-fuel ratio, there was a slight decrease in exhaust emission. Thus, with this arrangement, purging of the fuel tank can be effected through the idle system of a carburetor without affecting engine operation or causing an increase in exhaust emissions.
ln the embodiment of FIG. 2, where like numerals indicate like parts, conduit 62 is connected via metering orifice 60 to the upper end of idle passage 52 to inject the fuel vapor downstream of the metering area of the idle fuel system of the carburetor, but above off-idle port 58. In this embodiment, the metering orifice or bleed 60a at the top of idle tube 40 is in communication with air horn 12 via conduit 61. This arrangement provides the best vapor compensation with the liquid fuel rate decreasing in a linear fashion as the amount of vapor entering the idle system increases.
1 claim:
1. A method of storing and then recovering fuel vapor from the normally nonvented fuel tank of an engine and venting the thus stored fuel vapor through the idle system of the carburetor of the engine, said method comprising the steps of storing substantially all of the fuel vapor released from liquid fuel in the fuel tank under pressure in said fuel tank when the engine is not operating, releasing the stored fuel vapor under pressure during engine operation, conveying the released fuel vapor at above atmospheric pressure to the idle system of the carburetor during engine operation, admixing the fuel vapor with liquid fuel and aeriform fluid in the idle system of the carburetor to provide a predetermined air-fuel ratio, maintaining this air-fuel ratio by decreasing the quantity of liquid fuel in direct relation to the amount of fuel vapor conveyed into the idle system of the carburetor, and discharging the resulting air-fuel mixture from the idle port and off-idle port of the carburetor.
2. A fuel tank purge system for an internal combustion engine having a carburetor with an idle system including an idle tube connected to an idle air-bleed passage and in communication through an idle restriction with a lower idle air-bleed passage and through an idle passage to an idle port and off-idle port of said carburetor, and a pressure fuel reservoir, the systemcomprising valve-controlled conduit means connected to said pressure fuel reservoir in fuel vapor flow relation thereto and, metering orifice passage means connecting said conduit means to said idle system of said carburetor upstream in terms of the direction of flow of said idle port and said offidle port, said valve-controlled means including valve means to block fuel vapor flow to said idle system when the engine is not in operation and a pressure regulator valve adapted to block fuel vapor flow to said idle system when the pressure in said pressure fuel reservoir reaches atmospheric pressure.
3. A fuel tank purge system according to claim'2 wherein said metering orifice passage means is connected to said idle tube of said idle system.
4. A fuel tankpurge system according to claim 2 wherein said metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
5. A fuel tank purge system according to claim 2 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
6. A fuel tank purge system for an internal combustion engine having a pressure fuel tank and a carburetor with an idle system including an idle tube connected to idle-bleed passages and in communication through an idle restriction and an idle passage with an idle port and an off-idle port of said carburetor, said system comprising a vapor metering orifice passage means positioned in communication with the idle system of the carburetor upstream of the idle rt and off-idle port of said carburetor, and valve-controlle conduit means, including a pressure regulator valve, and a control-valve,'said valvecontrolled conduit means being connected at one end to the pressure fuel tank in vapor flow relation thereto and at its other end to said vapor metering orifice passage means, said pressure regulator valve being adapted to block fuel vapor flow to the idle system when the pressure in the pressure fuel reservoir reaches atmospheric pressure, said control valve being operable to block the flow of fuel vapor to said idle system of said carburetor when the engine is not in operation and operable during engine operation to permit the flow of fuel vapor to said carburetor.
7. A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle tube of said idle system.
8. A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
9. A fuel tank purge system according to claim 6 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
Claims (9)
1. A method of storing and then recovering fuel vapor from the normally nonvented fuel tank of an engine and venting the thus stored fuel vapor through the idle system of the carburetor of the engine, said method comprising the steps of storing substantially all of the fuel vapor released from liquid fuel in the fuel tank under pressure in said fuel tank when the engine is not operating, releasing the stored fuel vapor under pressure during engine operation, conveying the released fuel vapor at above atmospheric pressure to the idle system of the carburetor during engine operation, admixing the fuel vapor with liquid fuel and aeriform fluid in the idle system of the carburetor to provide a predetermined air-fuel ratio, maintaining this air-fuel ratio by decreasing the quantity of liquid fuel in direct relation to the amount of fuel vapor conveyed into the idle system of the carburetor, and discharging the resulting air-fuel mixture from the idle port and off-idle port of the carburetor.
2. A fuel tank purge system for an internal combustion engine having a carburetor with an idle system including an idle tube connected to an idle air-bleed passage and in communication through an idle restriction with a lower idle air-bleed passage and through an idle passage to an idle port and off-idle port of said carburetor, and a pressure fuel reservoir, the system comprising valve-controlled conduit means connected to said pressure fuel reserVoir in fuel vapor flow relation thereto and, metering orifice passage means connecting said conduit means to said idle system of said carburetor upstream in terms of the direction of flow of said idle port and said off-idle port, said valve-controlled means including valve means to block fuel vapor flow to said idle system when the engine is not in operation and a pressure regulator valve adapted to block fuel vapor flow to said idle system when the pressure in said pressure fuel reservoir reaches atmospheric pressure.
3. A fuel tank purge system according to claim 2 wherein said metering orifice passage means is connected to said idle tube of said idle system.
4. A fuel tank purge system according to claim 2 wherein said metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
5. A fuel tank purge system according to claim 2 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
6. A fuel tank purge system for an internal combustion engine having a pressure fuel tank and a carburetor with an idle system including an idle tube connected to idle-bleed passages and in communication through an idle restriction and an idle passage with an idle port and an off-idle port of said carburetor, said system comprising a vapor metering orifice passage means positioned in communication with the idle system of the carburetor upstream of the idle port and off-idle port of said carburetor, and valve-controlled conduit means, including a pressure regulator valve, and a control valve, said valve-controlled conduit means being connected at one end to the pressure fuel tank in vapor flow relation thereto and at its other end to said vapor metering orifice passage means, said pressure regulator valve being adapted to block fuel vapor flow to the idle system when the pressure in the pressure fuel reservoir reaches atmospheric pressure, said control valve being operable to block the flow of fuel vapor to said idle system of said carburetor when the engine is not in operation and operable during engine operation to permit the flow of fuel vapor to said carburetor.
7. A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle tube of said idle system.
8. A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
9. A fuel tank purge system according to claim 6 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86395569A | 1969-10-06 | 1969-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3610221A true US3610221A (en) | 1971-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US863955A Expired - Lifetime US3610221A (en) | 1969-10-06 | 1969-10-06 | Fuel tank purge system and method |
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| Country | Link |
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| US (1) | US3610221A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3844264A (en) * | 1972-11-09 | 1974-10-29 | L Grainger | Anti-pollution fuel system |
| US3886920A (en) * | 1974-04-12 | 1975-06-03 | Gen Motors Corp | Automotive vapor choke |
| US4003358A (en) * | 1974-08-27 | 1977-01-18 | Toyo Kogyo Co., Ltd. | Control system for controlling an air-fuel mixture in internal combustion engine |
| US4633843A (en) * | 1983-08-27 | 1987-01-06 | Andreas Stihl | Carburetor arrangement for an internal combustion engine |
| US4796593A (en) * | 1987-10-16 | 1989-01-10 | Colt Industries Inc. | Tank mounted valve for fuel vapor recovery system |
| US5249561A (en) * | 1991-09-16 | 1993-10-05 | Ford Motor Company | Hydrocarbon vapor sensor system for an internal combustion engine |
| US5373822A (en) * | 1991-09-16 | 1994-12-20 | Ford Motor Company | Hydrocarbon vapor control system for an internal combustion engine |
| US5743240A (en) * | 1996-02-07 | 1998-04-28 | Andreas Stihl | Hand-guided, portable tool with internal combustion engine |
| US5894833A (en) * | 1997-04-30 | 1999-04-20 | Kioritz Corporation | Internal combustion engine |
| US6227176B1 (en) * | 1998-07-16 | 2001-05-08 | Andreas Stihl Ag & Co. | Pressure equalization system for a fuel tank of an internal combustion engine |
| US20030111062A1 (en) * | 2001-12-13 | 2003-06-19 | Brandenburg Billy J. | Pressure actuated fuel vent closure and fuel shutoff apparatus |
| US6691683B2 (en) | 2001-03-28 | 2004-02-17 | Briggs & Stratton Corporation | Automatic fuel vent closure and fuel shutoff apparatus having electrical actuation |
| US20040040546A1 (en) * | 2002-04-12 | 2004-03-04 | Shears Peter D. | Internal combustion engine evaporative emission control system |
| US6986340B2 (en) | 2001-02-20 | 2006-01-17 | Briggs & Stratton Corporation | Automatic fuel vent closure and fuel shutoff apparatus having mechanical actuation |
| US20060096583A1 (en) * | 2004-11-05 | 2006-05-11 | Shears Peter D | Integrated fuel tank and vapor containment system |
| US20060096584A1 (en) * | 2004-11-05 | 2006-05-11 | Shears Peter D | Integrated fuel tank and vapor containment system |
| US20070068388A1 (en) * | 2005-09-27 | 2007-03-29 | Shears Peter D | Integrated air cleaner and vapor containment system |
| US7281525B2 (en) | 2006-02-27 | 2007-10-16 | Briggs & Stratton Corporation | Filter canister family |
| US20080251053A1 (en) * | 2007-04-16 | 2008-10-16 | Shears Peter D | Evaporative emissions control system |
| US20080251055A1 (en) * | 2007-04-16 | 2008-10-16 | Briggs & Stratton Corporation | Evaporative emissions control system |
| US20110048386A1 (en) * | 2009-08-27 | 2011-03-03 | Kyle Achor | Fuel vapor separator with evaporative emissions chamber and marine fuel system and engine therewith |
| US20140251270A1 (en) * | 2011-11-01 | 2014-09-11 | Pc/Rc Products, L.L.C. | Throttle Body Fuel Reservoir |
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| US2933894A (en) * | 1954-10-25 | 1960-04-26 | Gen Electric | Fuel proportioning dual fuel system |
| US3191587A (en) * | 1965-06-29 | Device for controlling the hydrocar- bon evaporation losses from automo- tive vehicles |
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| US3191587A (en) * | 1965-06-29 | Device for controlling the hydrocar- bon evaporation losses from automo- tive vehicles | ||
| US2933894A (en) * | 1954-10-25 | 1960-04-26 | Gen Electric | Fuel proportioning dual fuel system |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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