Dellortos, PSI ? Options

[80cap]

What PSI is ideal for a pair of 40's on a 2056 engine?
Brian

[porschetub]

I did some testing on my 1.8 with Weber rebuilt DCNF's a few years ago with Moprod low pressure pump mounted under the tank,holley low pressure regulator and gauge at engine.
I found this type of regulator won't go much lower than 3 psi,I noted a drop in pressure at revs I guessed this was the distance from pump to tank.
Set pressure at 3.2 psi and at stayed constant @ 3+,increased pressure to 3.4 and it went rich on idle,increased it to 3.5 and it flooded,coughed and stalled.
Some may have different experience but my test proved the needle and seats started to be overcome by pressure @ 3.4 psi,I'am sure this would apply to Dellorto's also.
I feel that's important to choose a pump that doesn't make too much more pressure that you need,my pump makes 6psi which is a good matchup for the holley low pressure regulator.