Power fuel supply system

Claim 2

A power fuel supply system for an internal combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having first and second inlets leading from said fuel bowl, said second fuel passage having third and fourth inlets leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure, said movable member including closure means which in one extreme position close all of said inlets, in the other extreme position open all of said inlets, and in an intermediate position close said first and third inlets and open said second and fourth inlets.

Claim 3

A power fuel supply system for an internal combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having first and second inlets leading from said fuel bowl, said second fuel passage having third and fourth inlets leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure, said movable member including a first closure member that in one position of said movable member overlies and closes said first and third inlets, and a second closure means resiliently mounted to the remainder of said movable member that in intermediate positions of said movable member overlies and closes said second and fourth inlets, said movable member being displaceable to one extreme position in which each of said inlets are closed by said first and second closure means, said movable element being displaceable to the opposite extreme position in which each of said inlets are unobstructed and spaced from said closure means, said movable element being positionable in intermediate positions in which said second closure means overlies and closes said second and fourth inlets and said first closure means is spaced from and is unobstructive of said first and third inlets.

Claim 4

A power fuel supply system for an internal combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having first and second inlets leading from said fuel bowl, said second fuel passage having third and fourth inlets leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure, said movable member including a first closure member that in one position of said movable member overlies and closes said first and third inlets, and a second closure means resiliently mounted to the remainder of said movable member that in intermediate positions of said movable member overlies and closes said second and fourth inlets, said movable member being displaceable to one extreme position in which each of said inlets are closed by said first and second closure means, said movable element being displaceable to the opposite extreme position in which each of said inlets are unobstructed and spaced from said closure means, said movable element being positionable in intermediate positions in which said second closure means overlies and closes said second and fourth inlets and said first closure means is spaced from and is unobstructive of said first and third inlets.

Claim 5

A power fuel supply system according to claim 2, said movable member having a portion protruding into said fuel bowl, valve seat means formed in a surface of said fuel bowl about said protruding end portion, said first and third inlets opening at said valve seat means so as to be closable by said first closure means upon displacement of said movable member, said second and fourth inlets opening at said valve seat means so as to be closable by said second closure means, compression spring means connecting said first closure means to said second closure means, said first closure means being fixed relative to said protruding portion in the direction of displacement of said movable member, said second closure member being movable relative to said protruding portion in the direction of displacement of said movable member.

Claim 6

A power fuel supply system according to claim 2, said movable member having a portion protruding into said fuel bowl, first and second valve seats formed in an interior surface of said fuel bowl about said protruding portion, said first and third inlets located in said first valve seat, said second and fourth inlets located in said second valve seat, said first closure means being engagable with said first valve seat to close said first and third inlets, said second closure means being engagable with said second valve seat to close said second and fourth inlets, compression spring means connecting said first closure means to said second closure means, said first closure means being fixed relative to said protruding portion in the direction of displacement of said movable member, said second closure means being movable relative to said protruding portion in the direction of displacement of said movable member.

Claim 7

A power fuel supply system according to claim 4, said carburetor including a bore opening into said fuel bowl, said movable member slidingly and sealingly received in said bore, said movable member including an abutment, said second closure means biased toward said abutment and away from said first closure means by said compression spring means.

Claim 8

A power fuel supply system according to claim 5, said first valve seat being axially spaced from said second valve seat, said first closure means being axially spaced from said second closure means, the axial distance between said first and second valve seats being less than the axial distance between said first and second closure means when said second closure means engages said abutment.

Claim 9

A power fuel enrichment system according to claim 6, said first and second valve seats each being annular in shape and concentric with said bore, said first closure means comprising a circular element of a diameter substantially equal to the major diameter of said first valve seat, said second closure means comprising a circular element of a diameter substantially equal to to the major diameter of said second valve seat.

Claim 10

A power fuel supply system for an internal combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having a first inlet leading from said fuel bowl, said second fuel passage having a second inlet leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure, said movable member including closure means which in one extreme position overlies each of said inlets and seals one inlet from the other and in the other extreme position is removed from each of said inlets.

Claim 11

A power fuel supply system for an internal combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having a first inlet leading from said fuel bowl, said second fuel passage having a second inlet leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure, said movable member including closure means which in one extreme position overlies each of said inlets and seals one inlet from the other and in the other extreme position is removed from each of said inlets.

Claim 12

A power fuel supply system for an internal Combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having a first inlet leading from said fuel bowl, said second fuel passage having a second inlet leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure. said movable member including closure means which in one extreme position individually close each of said inlets and in the other extreme position open each of said inlet ports, said movable member having an end portion protruding into said fuel bowl, a valve seat formed in a surface of said fuel bowl about said protruding end portion, said first and second inlets opening from said valve seat.

Claim 13

A power fuel supply system for an internal Combustion engine carburetor having at least two barrels, said carburetor including a fuel bowl, a first fuel passage interconnecting said fuel bowl and a first of said barrels, a second fuel passage interconnecting said fuel bowl and a second of said barrels, said first fuel passage having a first inlet leading from said fuel bowl, said second fuel passage having a second inlet leading from said fuel bowl, a vacuum motor having a variable volume chamber in communication with a source of engine intake manifold vacuum, said vacuum motor including a movable member displaceable in response to changes in intake manifold vacuum pressure. said movable member including closure means which in one extreme position individually close each of said inlets and in the other extreme position open each of said inlet ports, said movable member having an end portion protruding into said fuel bowl, a valve seat formed in a surface of said fuel bowl about said protruding end portion, said first and second inlets opening from said valve seat.