needle and seat

needle and seat
A pair of items in a carburetor. The seat is usually a brass plug with a specially shaped hole to accommodate the needle which is a shaft with a pointed end. When the needle is fully seated in the seat, no gasoline can enter the float bowl. As the needle is lifted off the seat some gas pours into the float bowl. The needle moves when the float in the float bowl drops below a set height.

Dictionary of automotive terms. 2015.

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