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It only takes a small amount of pressure to force the needle open---this didn't used to be such a problem until higher hp cars needed more fuel and the enlarged the seat size which in turn increased the area of the needle for the pressure to push against which some floats can't overcome
for instantance---going from a .050 seat to a .100 seat is four times as much area so float has to overcome 4 times as much hydraulic pressure
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