RE: SAITO 220
To the best of my knowledge Saito has never had a "Real" fuel pump. What they have is instead an air pump to pressurize the tank, similar to the Cline and Iron Bay systems. But instead of using a regulator they used a valve in line as a calibrated leak to control the fuel pressure.
I've never set one up this way, but it seems to me that it would be extremely difficult to get a good idle and top end both with a given pressure setting.
Bill.