fuel regulator required?

My zx1100 engine has carbs.   There were orignially garavity fed when it was still a motorcycle.  I've got a Facet electric fuel pump. it puts out a max of 40psi. Questions: do I need an adjustable fuel regulator to reduce pressure to about 3psi?  If so what type is best? One blog said a low pressure fuel regulator should incorporate a return hose to send fuel back to the tank when the engine requires little fuel. is this true? appreciate advice. Gene