"That regulates it by engine demand/vac in manifold,the system pressure can only be max pump output at no demand."
er that dont sound right
there is two ways of looking at it with the vac pipe disconected or engine not running or manifold at atmosperic pressure you get base fuel pressue this is the quoted pressue of the regulator
the pressure in the vac pipe changes it by a factor of 1:1 so if you had a 3bar reg and -0.5bar vac the fuel pressure will be 2.5 bar if you have a turbo car it will raise pressure above this base value
its to keep the fuel flow at an equal flow rate at the injector nozzle as the maifold pressue is sucking it ot or pushing it back in on a turbo
max pump output will be 9 bar or so the reg vents fuel back to tank to regulate pressure
i would say 2.5bar base by the sound of it and older injection systems usualy run sub 3 bar
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