What is the function of the Sniffle Valves?

The function of the Sniffle Valves is to vent fuel and air overboard as necessary. These valves play a crucial role in maintaining the integrity of the fuel system by allowing for the controlled release of excess pressure or vacuum that may build up in the fuel tank due to changes in fuel levels, temperature, or atmospheric conditions.

When fuel is consumed, the volume within the tank decreases, potentially creating a vacuum. Conversely, if the fuel expands due to temperature increases, this can create excessive pressure. The Sniffle Valves effectively manage this by opening to release either air or fuel vapors to the atmosphere, thereby preventing pressure imbalances that could damage the tank or affect fuel flow. This function contributes to both safety and operational efficiency by ensuring that the fuel system remains balanced without leaking or experiencing undue strain.