Fuel pump regulation vs. supply voltage

[DIRK BROER]

>Question: how good is the fuel pump regulation as the supply voltage varies?

Typically you run a high pressure pump - lets say 75psi and then use a 
regulator that references  to manifold vacuum - something like 50psi above 
manifold vacuum.  This helps insure that a given pulse width will alow a 
given amount of fuel in - no matter what the intake pressure is - even if 
its under boost.  Pressures like 100psi - could be a safety concern so a 
little careful planning is in order.  Use only fuel lines desinged for this 
pressure - better yet use braided steel lines for all flexible lines.

Dirk