23-01-2024, 01:27 PM
That's reet clever! Fuel flows in from A via B in the 'on' position. As air enters from the vent pipe at B, it prevents a syphon forming. Whe the fuel level in the tank reaches the same level as B it acts like a baffle and stops the flow. The reserve setting directs flow straight from A to C, allowing the tank to empty.