Originally Posted by Karl
Indeed the std regulator is a 1:1 rising rate.
Why I call it a rising rate is simply to distinguish between a normal fixed pressure regulator and one which increases fuel pressure against manifold vacuum/pressure.
Of course if we're being pedantic we should call it a manifold pressure linked fuel pressure regulator that rises and falls linearly with manifold pressure but its just how I tend to refer to them to keep things simple for folk.
In the case of regulators like the fse I still call them rising rate but refer to the different ratio rather than 1:1. (e.g. 1.2:1)
the fuel rail pressure on a cossie rises relative to atmosphere, but stays constant relative to manifold pressure.
a truely rising rate reg will increase the fuel rail pressure relative to manifold pressure
alles klar?