A pump with 2.5 to 3.5 should work OK. The maximum inlet pressure recommended by Zenith for our carburetor is 4 psi.
Don
Thanks Don, and a thumbs up. This being my first post was begining to wonder If I knew what I was doing. Ordered your repair manuel so will try and not bother ya'll too much. I am presently restoring a 30' Ericson 1969 model. Will need all the help I can find