<<<Measured fuel=
pressure: 36 psi at idle with vacuum connected. 42 psi (at
any engine speed) with vacuum line disconnected. If increase engine s=
peed
(with vac. connected), fuel pressure decreases (yes, DECREASES) to about=
32
psi.>>>
Stock pressure regulators pressure is set 29 with vacuum 36 without vacu=
um.
When the engine increases RPMS, the vacuum increases and lowers the pres=
sure.
On my dual diaphragm adjustable fuel pressure regulator (I increas=
ed the
stock cam duration by about 8 degrees and was told that this would lower=
the
vacuum. I think that with all the other changes to my engine, it w=
as not
affected), it would drop down to 22 psi, I felt that this is too low. &n=
bsp;I
tried different ways to restrict/reduce the vacuum, but none seemed to w=
ork,
so I cut some holes in one of the diaphragms to reduce the pressure drop=
.
That worked and the power increased at upper rpms (4000+).
You can get a stock regulator or a single diaphragm one from CB Performa=
nce
and that set it to your engine.
Your regulator is damaged and giving you too high a fuel pressure even w=
ith
the hose off.
<<<An observation: I noticed that the position of the AFM wi=
per is about 20
or 25% "open" with the engine idling. This seemed surprisingly high t=
o me,
but I have no reference. Could be normal.>>>
Mine does the same during my testing. At 4500 rpms the AFM was not=
at full
swing either.
Robert