A carburetor comprising a fuel/air induction passage, a secondary orifice communicating with the induction passage, and a fuel supply system operable to supply fuel from a source of fuel to the secondary orifice, the fuel supply system including a wall defining an elongated enclosed chamber having a longitudinal axis and a first end, the wall including an inlet communicating between the source of fuel and the chamber, and, Check Valves at the second end, an outlet communicating between the chamber and the secondary orifice, the outlet including a valve seat, a valve member within the chamber and including a needle portion adapted to engage the valve seat, the valve member being movable within the chamber along the longitudinal axis of the chamber relative to a closed position wherein the needle portion sealingly engages the valve seat, a spring biasing the valve member toward the closed position,Needle Valves and an adjustment rod selectively engageable with the valve member for selectively and releasably moving the valve member away from the closed position. A valve apparatus comprising wall means defining an elongated enclosed chamber having a noncircular cross-sectional area, a longitudinal axis, and opposed first and second ends,PLUG VALVES said wall means including an inlet intermediate said first and second ends and, at said second end, an outlet including a valve seat, a valve member within said chamber and including a body portion having a noncircular cross-sectional area less than the area of said chamber such that said body portion cannot rotate within said chamber, said body portion including an end facing said first end of said chamber and having therein an internally threaded bore with a longitudinal axis parallel to said longitudinal axis of said chamber, said valve member also including a needle portion facing said valve seat and adapted to engage said valve seat, said valve member being movable within said chamber along said longitudinal axis of said chamber relative to a closed position wherein said needle portion sealingly engages said valve seat, an adjustment rod extending through said wall means at said first end of said chamber, said adjustment rod having a longitudinal axis colinear with said longitudinal axis of said threaded bore and being rotatable about and movable along said longitudinal axis of said rod inwardly into and outwardly of said chamber, said rod having an end extending inwardly into said chamber, said end being externally threaded and adapted to threadably engage said internally threaded bore in said valve member, means biasing said valve member toward said closed position, said means including a spring positioned in said chamber between said valve member and said first end of said chamber, means biasing said adjustment rod outwardly of said chamber, means restricting the movement of said adjustment rod outwardly of said chamber such that, when said threaded end of said adjustment rod is out of engagement with said threaded bore, said end of said rod is positioned closely adjacent said valve member, and means restricting the movement of said adjustment rod inwardly into said chamber such that, after said rod is moved inwardly into said chamber and rotated so that said threaded end of said rod engages said internally threaded bore in said valve member, further rotation of said rod causes said valve member to move away from said closed position.

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