Flottörnålar

Flottörnålar, often referred to as float needles or needle valves, are critical components within a carburetor's fuel system. Their primary function is to regulate the fuel level in the float bowl. The needle is attached to a float, which rises and falls with the fuel level. When the fuel reaches a predetermined height, the float lifts the needle, seating it against a matching valve seat. This seals the fuel inlet, preventing further fuel from entering the bowl and causing an overflow. Conversely, as the engine consumes fuel and the level in the bowl drops, the float descends, lifting the needle off its seat and allowing fuel to flow in again.

The precise calibration and condition of the flottörnål are essential for proper engine operation. If the needle or its seat is worn or damaged, it can lead to a fuel leak, an incorrect fuel level in the bowl, or an inability to maintain the correct level. This can manifest as a range of performance issues, including engine stalling, poor idling, excessive fuel consumption, or a rich fuel mixture. Flottörnålar are typically made of brass or rubber and are designed to create a tight seal. Replacement is often necessary when maintenance is performed on a carburetor to ensure optimal fuel delivery and engine efficiency.