Matt,
Look! :)

Paul Lamar


Why do you even bother asking the group, Paul?? You already know what to
do.. ;)

Sorry, I apparently missed that part of the thread..

So, you see the same fluctuation in fuel pressure with the mechanical
gauge?


Matt-

I have not tested it yet. I was not happy with my mickey mouse
plumbing job so I re plumbed with steel brake line this morning.
I need to leave bright and early tomorrow morning so I won't
get a chance to run the engine again until I get back in about
a week.

I discovered Edelmann automotive fittings, hoses, lines & tubing.
These are the hot tip for mechanical pressure gages. Super robust.
The 3/16th OD black steel line is easy to bend and work with.
These MUST be reliable as they are car brake lines. Much cheaper
than AN braided lines.

http://www.plews-edelmann.com/

With out the engine running it is a solid 40 psi.
As you can see the vacuum lines are tapped into the dynamic
chamber. There is lots going on in there aerodynamically speaking.

I will eventually move them to the now unused oil injection holes
in the rotor housings. It will mean retuning the engine.


Paul Lamar
-

Sounds good.

I wonder how quickly the regulator can respond to changes in manifold
pressure.
I don't know precisely how the mechanism works but imagine it's
probably a
little chamber with a diaphragm that pushes on a spring loaded
tapered rod.
I imagine there's some mass and maybe some friction that probably
already
damps the pressure.


Matt-

Is the 40psi too low to keep up ? Virg


Hi
          40 psi is the normal fuel pressure for a EFI system with
engine stopped or wide open throttle, the pressure will decrease with
increase in vacuum in intake system, or decrease in manifold pressure.
It is pretty hard to see how the fuel pressure could increase and
decrease so rapidly, due to style of pressure regulator, I would be more
inclined to think it is electrical, ie. the electrical sensor/digital
readout.
          John Burey