[diesel_john]

The whole idea of this concept flow meter on the last page was to create a flow meter that could be built from home improvement type parts with no power tools but a drill. The concept meter was built with common hand tools. The parts were sanded by hand on a flat surface. The size of the engine determines the size of the ball. The smaller the engine, the closer the fit between ball and groove. If a center bolt is needed an o-ring is used to seal it. Drill a hole in the center bolt if it is used for the outlet connection. The plastic BB toleranted both gasoline and diesel fuel. Type of plastics used would determine the temperature range. Use a light source and sensor to count the ball rotations. Your mileage may vary.