3Dreaming wrote:I had one airplane that the new fuel pump was to much for the carb. It would overpower the needle at idle and the engine would run rough. After trying a few things myself I removed the carb and sent it to Leading Edge Airfoils and they worked some magic on it and the problem went away.
So, in that case the extra pressure just uncovered an existing issue.
Otherwise, it seems it would be trivial to install a metered orifice at the pump’s output to slightly lower the pressure.
As an aside, BMW airheads were/are notorious for carb float bowls overflowing due to needle/seat problems, even with just gravity feed. Has led to a lot of gas-soaked boots over the years!