I have a plane with a 16oz tank with a OS61FX and the running time on full tank exceeds 25-30 mins. When I want the cg to be more to the rear, and a shorter flight time, I normally pump fuel into an external 10oz bottle, then pump this amount into the tank. I am looking for an easier way to meter the fuel. Is there any device available that I can connect in-line with my electric fuel pump so that the volume of fuel pumped to the fuel tank can be monitored. Thanks for the inputs...........