Originally Posted by
Sport_Pilot
Actually it can help, but only within limits. Obviously if the needle is below the bottom of the tank or above the top of the tank it will not help. If the center line is at say a 1/4 tank above or below the needle it will not help when the tank is full or 1/4 empty but will help when the fuel level is between that.
I'm not quite sure how you figure that Sport. Let's use your example and put the tank 1/4 tank high, the floor of the tank is 1/4 tank below the needle, the roof is 3/4 above. Roll inverted and the 'floor' is now 3/4 below and the 'roof' 1/4 above. The fuel head varies by 1/2 the tank height wether it's a uniflow or standard tank. The amount of fuel in the tank is irrelevant.
Dave H