RE: O.S. 46 FX on a pipe
It really doesn't take much pressure to keep up with the fuel demand of a sport .40 getting run like this one....especially with a throttle.
The important thing is consistent pressure that gives the carburetor something to work with till the tank is empty.
It doesn't seem wise to move the tap unless this setup proves that it needs more pressure.
So of course, I side with lfinney......[8D]