Norton factory did. They had racers with an underslung gas tank. To get the fuel where it was needed there was a mechanical fuel pump linked to the swingarm. The fuel pump was a diaphragm type like an older carburated engine would use. The pump was linked to the arm so the action of the arm would pump the fuel. The fuel went to a small feed tank in the standard position above the carbs. The feed tank had a stand pipe running to the underslung main tank below the engine. As the feed tank filled to maximum, the standpipe would flow the excess back to the main tank.
Funny story. I think it was Daytona when a friend told me about these Nortons. They were on the starting line and the riders of the Nortons were bouncing up and down on the seat keeping the feed tanks full. First one, then another, then the entire field started to bounce up and down on their seats. :^)
Tom, been around.