Needle and seat meaning

Needle and seat definition

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.

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