For idling or when required rich mixture, extra fuel is supplied by the idling system into the venturi tube.So the quantity of the mixture provided into the cylinder is controlled by the throttle valve and hence controls output power. The SI engine is a quantity governed engine. Get deals on automotive parts, truck parts. Opened throttle valve allows more air to flow under more suction causes the piston moves upward direction and increases the jet area in. This mixture can be obtained by pulling the jet in a downward direction with the help of a lever. This air fuel mixture provided to the cylinder through the throttle valve. Buy Berryman Chem-Dip Carburetor Parts Cleaner with Basket - 96 oz - NCB 0996 online from NAPA Auto Parts Stores. Starting of SU carburetor: At the time of starting the engine, a rich mixture of air and fuel is very important.So they are chosen as such, they can give the desired air-fuel ratio. The fuel-air ratio depends on the size of the discharge jet and metering system.It drives fuel from the float chamber to the venturi tube through a fuel supply tube and the fuel is discharged into the air stream. This pressure difference is known as carburetor depression. This will create a pressure difference between the float chamber and the venturi tube.Due to this high velocity, the pressure at the throat goes down below float chamber pressure. This air has a maximum velocity at the throat. The fuel supply nozzle connects at the throat of the venturi tube. Venturi is a tube of decreasing cross-section and has a minimum area at the throat. During suction stroke air is drawn into the cylinder through the venturi tube.This will avoid overflow when the engine is not running. The one end of the fuel supply nozzle connected to the bottom of the float chamber and the other one is to the venturi tube slightly above the designed fuel level in the float chamber. Check out the Sierra Marine Parts Catalog for a complete listing of Direct Replacement Mercury Marine Parts for almost every Outboard and Inboard Motor manufacturer in the Marine Industry. The fuel discharge nozzle connects the float chamber to the venturi tube.If the fuel reaches the designed limit, the float goes up, which closes the fuel supply valve and thus stops fuel supply into the float chamber. If the amount of fuel in the float chamber goes down below the designed limit, the float goes down which opens the fuel supply valve and allows fuel to flow into the float chamber. The float maintains a constant level of fuel into the float chamber.It does not allow dust and other suspended particles into the float chamber which can choke any fuel passage. First fuel is supplied into the float chamber through strainer.
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