Originally Posted by
piperboy84
BPF maule mx7 180a with the Peterson and maule Mogas stc which involves adding an electric pump to the supply
With a gravity fuel feed to a carburator I just can't see how the engine would not get fuel when set on both even if one tank was empty.
For fuel injected engines it is a different story as you must have a central collector tank in order to have a both setting even in high wing aircraft.
BTW there is a vent line on high wing Cessna's that runs across the top of the cabin from the right tank to the left tank. The left tank is then connected to the vent behind the left wing strut. Placing the fuel selector to left will not stop fuel moving from the right tank to the left tank via the vent line and then overboard out the vent, if the aircraft is parked on a slope with the left wing down.